[chore] Add flake8 workflow

Closes anitab-org#226

.flake8

@@ -0,0 +1,3 @@
+[flake8]
+ignore = F401,F405,W503,F841,F403,E402,F821,W291,E266,F811
+max-line-length = 120

.github/workflows/flake8-check.yml

@@ -0,0 +1,20 @@
+name: Flake8 Check
+
+on: [push, pull_request]
+
+jobs:
+  lint:
+    name: Linting with Flake8 
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python 3.7
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.7
+      - name: Installing Dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install flake8==3.8.4
+      - name: Running Flake8 checks
+        run: ./flake8-check

flake8-check

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+flake8-check() {
+    flake8 && echo "Flake8 Check ✅" ||{
+        >&2 echo "Flake8 Check ❌"
+        echo "Suggestion: Run - flake8 ."
+        echo ""
+        FAILURE=1
+    }
+}
+
+flake8-check
+exit $FAILURE