Added contributing.md and test to run on PR

Author: Adwaith-Rajesh

.github/workflows/pr-test.yml

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+name: PR test
+
+on:
+  pull_request:
+    branches: [master]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: [3.8, 3.9]
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install pytest
+          if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+      - name: Test with pytest
+        run: |
+          pytest -v

CONTRIBUTING.md

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+# How to contribute
+
+We'd love to accept your patches and contributions to this project. There are
+just a few small guidelines you need to follow.
+
+First, read these guidelines.
+
+When contributing to this repository, please first discuss the change you wish to make via issue, email, or any other method with the owners of this repository before making a change.
+
+Before you begin making changes, state your intent to do so in an Issue.
+Then, fork the project and create a new branch. Make changes in your copy of the repository.
+Then open a pull request once your changes are ready.
+
+## Code style
+
+The project follows a convention of:
+
+- Maximum line length: 120 characters
+- Use reorder-python-imports
+- Use autopep8, flake8
+- Strict PEP8 conventions.
+- Completely type hinted and verified using mypy
+- No type comments
+- Three double quotes around docstrings.
+
+All theses can be done using pre-commit. To use pre-commit on this project run the following commands after forking the repo.
+
+```commandline
+pip install -r requirements-dev.txt
+```
+
+```commandline
+pre-commit install
+```
+
+This will enforce all the code styling before you commit.
+
+## Testing
+
+When a new addition is made to the source code, test should be written to prove that you changes work and does not break the existing code