chore 📦: Add markdown linting config for line length and code block formatting

This commit adds a new markdown linting configuration to enforce line length limits and consistent formatting of code blocks across the project.

.markdownlint.json

@@ -0,0 +1,7 @@
+{
+    "MD013": {
+        "line_length": 100,
+        "code_block_line_length": 120,
+        "tables": false
+    }
+}