Set up black for GitHub CI pipeline (#99)

Summary:
This PR introduces a linter, black, for linting purposes.

Pull Request resolved: #99

Test Plan: Please refer to the actions tab of the forked repository ([link](https://github.com/TaekyungHeo/param/actions)). At present, PARAM does not pass the linter checks. Additional refactoring is necessary.

Reviewed By: briancoutinho

Differential Revision: D55261475

Pulled By: shengfukevin

fbshipit-source-id: 2c92790e60e1e3fb1ed17fb2f4c6954a755bec18

.github/workflows/python_lint.yml

@@ -0,0 +1,21 @@
+name: Python Linting
+
+on: [push, pull_request]
+
+jobs:
+  lint-and-format:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: '3.8'
+
+    - name: Install dependencies
+      run: |
+        pip install black
+    - name: Run Black
+      run: black . --check