Add build instructions to README

README.md

@@ -2,6 +2,25 @@
 
 CharaChorder's all-in-one desktop app, supporting Linux, Windows, and MacOS.
 
+## Build
+1. Get Python 3.11 (using [pyenv](https://github.com/pyenv/pyenv) recommended)
+2. Clone and build
+```
+git clone https://github.com/CharaChorder/nexus
+cd nexus/
+python dist.py
+```
+Note: the CI-generated binaries (in releases) don't work at the moment (see [#6 CI doesn't work](https://github.com/CharaChorder/nexus/issues/6)).
+`dist.py` sets up a virtualenv in the root directory of the repo, and generates a platform-dependent executable in the `dist/` directory.
+
+## Usage
+```
+cd dist/ # if following the steps above
+./nexus # Unix
+.\nexus.exe # Windows
+```
+Use the `-h` to access CLI options.
+
 ## Contributing
 
 Please create PRs and issues, we welcome all contributions. See issues tagged with `Help Wanted` for where you can best help.