Add a .pre-commit config file

Avoid this CI error message:
	=====> .pre-commit-config.yaml is not a file

Author: DimitriPapadopoulos

.pre-commit-config.yaml

@@ -0,0 +1,29 @@
+---
+repos:
+  - repo: https://github.com/executablebooks/mdformat
+    # Do this before other tools "fixing" the line endings
+    rev: 0.7.17
+    hooks:
+      - id: mdformat
+        name: Format Markdown
+        entry: mdformat # Executable to run, with fixed options
+        language: python
+        types: [markdown]
+        args: [--wrap, "75", --number]
+        additional_dependencies:
+          - mdformat-toc
+          - mdformat-beautysh
+          # -mdformat-shfmt
+          # -mdformat-tables
+          - mdformat-config
+          - mdformat-black
+          - mdformat-web
+          - mdformat-gfm
+  - repo: https://github.com/adrienverge/yamllint.git
+    rev: v1.33.0
+    hooks:
+      - id: yamllint
+        args:
+          - --no-warnings
+          - -d
+          - "{extends: relaxed, rules: {line-length: {max: 90}}}"