Add pre-commit hook file (#2759)

Hooks added:
* black
* flake8
* clang-format
* add trailing-whitespace 
* end-of-file-fixer
* markdown linter

.pre-commit-config.yaml

@@ -0,0 +1,31 @@
+---
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.4.0
+    hooks:
+      - id: trailing-whitespace
+      - id: end-of-file-fixer
+  - repo: https://github.com/igorshubovych/markdownlint-cli
+    rev: v0.33.0
+    hooks:
+      - id: markdownlint
+  - repo: https://github.com/psf/black
+    rev: 22.3.0
+    hooks:
+      - id: black
+        exclude: |
+          (?x)^(
+                python/libgrass_interface_generator/
+          )
+  - repo: https://github.com/pycqa/flake8
+    rev: 3.9.2
+    hooks:
+      - id: flake8
+        exclude: |
+          (?x)^(
+                python/libgrass_interface_generator/
+          )
+  - repo: https://github.com/pre-commit/mirrors-clang-format
+    rev: v15.0.6
+    hooks:
+      - id: clang-format