Remove update_sha and use the latest commit for pkgs dependencies, up…

…date README for code style check and unit test.

.github/workflows/test.yml

@@ -5,9 +5,6 @@ name: AWS Distro Tests
 on:
   push:
   pull_request:
-env:
-  CORE_REPO_SHA: da48e0b131ff34ff382b7d1206f71b2e31929cab
-  CONTRIB_REPO_SHA: 7c12ad9844ac179e3f6a493491707a9bafd06f6b
 
 jobs:
   misc:

README.md

@@ -6,6 +6,28 @@ This project provide AWS Distro base on [OpenTelemetry Python Contrib](https://g
 preconfigured for use with AWS services. Please check out that project too to get a better
 understanding of the underlying internals.
 
+## Code Style Check
+
+This package applys code style check automatically when created a push/pull request to the project repository. You can apply style check locally before submitting the PR by following:
+1. Install related packages:
+```sh
+pip install isort pylint black flake8
+```
+2. Check code style errors:
+```sh
+python scripts/eachdist.py lint --check-only
+```
+3. Apply the fix for the errors automatically:
+```sh
+python scripts/eachdist.py lint
+```
+
+## Unit test
+This package detects all the unit tests defined in folder with naming "tests"/"test" under the same directory as pyproject.toml file. Please make sure to add unit test everytime a new feature added. 
+The workflow will run the test tox environment automatically whenever there is a push/pull request. Please make sure you install the related package needed for the unit tests in `commands_pre`.
+
+If you want to test a specific component/feature, please add a new environment in tox.ini file, and add related workflow as needed.
+
 ## License
 
 This project is licensed under the Apache-2.0 License.