Add GitHub action for pre-commit (TheAlgorithms#2515)

* Add GitHub action file for pre-commit

* Fix errors exposed by pre-commit hook:

- Remove executable bit from files without shebang. I checked those
  file and it was not needed.
- Fix with black

* Apply suggestions from code review

Co-authored-by: Christian Clauss <[email protected]>

Co-authored-by: Christian Clauss <[email protected]>

Author: dhruvmanila

.github/workflows/pre-commit.yml

@@ -0,0 +1,15 @@
+name: pre-commit
+
+on: [push, pull_request]
+
+jobs:
+  pre-commit:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+      - name: Install pre-commit
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install --upgrade pre-commit
+      - run: pre-commit run --verbose --all-files --show-diff-on-failure

machine_learning/scoring_functions.py

@@ -15,7 +15,7 @@ def extract_user_profile(script) -> dict:
     May raise json.decoder.JSONDecodeError
     """
     data = script.contents[0]
-    info = json.loads(data[data.find('{"config"'): -1])
+    info = json.loads(data[data.find('{"config"') : -1])
     return info["entry_data"]["ProfilePage"][0]["graphql"]["user"]