docs: Add docs for pre-commit setup

README.md

@@ -82,7 +82,8 @@ The following services are exposed:
 ### Secrets Discovery and namespacing
 
 1. For each PR, Sarthi creates a preview environment using the `docker-compose` specified.
-2. Sarthi finds the secret for the service as follows.
+2. Before Submitting a Pull Request, install pre-commit using `pip3 install pre-commit` and install the pre-commit git hooks: `pre-commit install`.
+3. Sarthi finds the secret for the service as follows.
    - Check the vault under the `project/feature-branch` namespace and find secrets there.
    - There is a default namespace reserved for developers to specify default secrets for all the PS. Secrets defined under `project/default-dev-secrets` are used if `project/feature-branch` secret path is empty.
    - If the default namespace is not configured as well, Sarthi automatically tries to find `sample.env`, `env.sample`, `.env.sample` and similar sample env files in the root directory and loads those sample environment variables to both `default-dev-secrets` and `project/feature-branch`