diff --git a/.github/workflows/coverage.yaml b/.github/workflows/coverage.yaml
new file mode 100644
index 0000000..b831d3c
--- /dev/null
+++ b/.github/workflows/coverage.yaml
@@ -0,0 +1,51 @@
+#
+# Copyright (C) 2019 - 2020 Tuono, Inc.
+# All Rights Reserved
+#
+# On a pull request or push into master, this runs the unit tests
+# and reports coverage.
+#
+---
+name: coverage
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+jobs:
+  coverage:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.7.7]
+
+    steps:
+      - name: Dump GitHub context
+        env:
+          GITHUB_CONTEXT: ${{ toJson(github) }}
+        run: echo "${GITHUB_CONTEXT}"
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - uses: actions/checkout@v2
+
+      - name: Install Build Dependencies
+        run: python3 -m pip install -rrequirements/ci.txt
+
+      - name: Enforce pre-commit
+        run: |
+          python3 -m pip install pre-commit
+          pre-commit install
+          pre-commit run -a
+
+      - name: Build, Test, Coverage
+        run: make coverage
+
+      - uses: codecov/codecov-action@v1
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          file: ./coverage.xml
diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
new file mode 100644
index 0000000..3b15ef6
--- /dev/null
+++ b/.github/workflows/release.yaml
@@ -0,0 +1,57 @@
+#
+# Copyright (C) 2019 - 2020 Tuono, Inc.
+# All Rights Reserved
+#
+---
+name: release
+on:
+  release:
+    types:
+      - published
+
+jobs:
+  publish-gemfury:
+    # publishes a pypi package to GemFury
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.7.7]
+
+    steps:
+      - name: Dump GitHub context
+        env:
+          GITHUB_CONTEXT: ${{ toJson(github) }}
+        run: echo "${GITHUB_CONTEXT}"
+
+      - uses: actions/checkout@v2
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install Build Dependencies
+        run: python3 -m pip install -rrequirements/ci.txt
+
+      - name: Publish
+        id: publish
+        run: |
+          rm -rf dist/
+          VERSION=$(python3 setup.py --version)
+          echo "::set-output name=version::$VERSION"
+          python3 setup.py sdist
+          PACKAGE=$(ls dist/*)
+          curl --fail -F package=@${PACKAGE} https://${{ secrets.GEMFURY_PUSH_TOKEN }}@push.fury.io/tuono/
+
+      - name: Show Version
+        run: echo "${{ steps.publish.outputs.version }}"
+
+      - name: Notify
+        uses: homoluctus/slatify@v2.1.0
+        if: always()
+        with:
+          type: ${{ job.status }}
+          job_name: ${{ github.repository }} publish ${{ steps.publish.outputs.version }} to gemfury
+          username: tubot
+          icon_emoji: ":monorail:"
+          url: ${{ secrets.SLACK_WEBHOOK_URL }}
diff --git a/.yamllint b/.yamllint
index 3197762..30d7f58 100644
--- a/.yamllint
+++ b/.yamllint
@@ -6,3 +6,4 @@ rules:
     max: 120
   truthy:
     level: error
+    allowed-values: ['true', 'false', 'on']
diff --git a/README.md b/README.md
index 146478c..12df6b0 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,91 @@
 # interposer
 
-FIXME: write content
+[![Build Status](https://github.com/tuono/interposer/workflows/coverage/badge.svg)](https://github.com/tuono/interposer/actions?query=workflow%3Acoverage)
+[![Release Status](https://github.com/tuono/interposer/workflows/release/badge.svg)](https://github.com/tuono/interposer/actions?query=workflow%3Arelease)
+[![codecov](https://codecov.io/gh/tuono/interposer/branch/master/graph/badge.svg?token=HKUTULQQSA)](https://codecov.io/gh/tuono/interposer)
+[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
+
+This library lets you wrap any class or bare function and:
+
+1. Record all the method calls (parameters, return values, exceptions).
+2. Playback all the method calls.
+3. Inspect the method calls to ensure they meet certain criteria.
+
+## Record and Playback
+
+The recorder is useful where you are dealing with a third party
+library and you would like to:
+
+- Occasionally ensure your code works live,
+- Record detailed responses from third party libraries instead
+  of mocking them,
+- Always ensure your code works.
+
+Recording has advantages and disadvantages, so the right solution
+for your situation depends on many things.  Recording eliminates
+the need to produce and maintain mocks.  Mocks of third party
+libraries that change or are not well understood are fragile and
+lead to a false sense of safety.  Recordings on the other hand
+are always correct, but they need to be regenerated when your
+logic changes around the third party calls.
+
+## Call Inspection
+
+You may want to limit the types of methods that can be called in
+third party libraries as an extra measure of protection in certain
+runtime modes.  Interposer lets you intercept every method called
+in a wrapped class.
+
+## Usage
+
+1. Instantiate an Interposer with a datafile path, and set
+   the mode to Recording.
+2. To wrap something, call wrap() and pass in the definition.
+3. Use the returned wrapper as if it were the actual definition
+   that was wrapped.
+4. Every use of the wrapped definition will record:
+   - The call name
+   - The parameters (positional and keyword)
+   - The return value, if no exception was raised
+   - The exception raised, should one be raised
+
+In most cases you want to leverage environment variables with
+your own method that retrieves a class, for example if you want
+to wrap the AWS boto3 library:
+
+    import boto3
+    import interposer
+    import os
+
+    if os.get("RECORDING_FILE"):
+        global client_args
+        wrapper = interposer.Interposer(os.get("RECORDING_FILE"), interposer.Mode.Recording)
+        client = boto3.client("ec2", **client_args)
+        wrapped_client = wrapper.wrap(client)
+        return wrapped_client
+
+Now any method call on `client` will be recorded.  To play back the same
+stream with the same code, change the interposer mode to Playback and re-run
+the code.  Instead of calling boto3, the interposer will intercept and provide
+the same return values or exceptions that boto3 provided during recording for
+given combinations of method names and parameters.
+
+## Restrictions
+
+- Return values and Exceptions must be safe for pickling.  Some
+  third party APIs use local definitions for exceptions, for example,
+  and local definitions cannot be pickled.  If you get a pickling
+  error, you should subclass Interposer and provide your own
+  cleanup routine(s) as needed to substitute a class that can be
+  substituted for the local definition.
+
+## Notes
+
+- This is a resource, so you need to call open() and close() or
+  use the ScopedInterposer context manager.
+- The class variables are ignored for purposes of hashing the
+  method calls into unique signatures (channel name + method name
+  + parameters).
+
+This documentation is not complete, for example pre and post cleanup
+mechanisms are not documented, nor is the security check for call inspection.