Restructure README with personal learning journey and create automated notes system

src/notes/242_valid_anagram.md

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+# Valid Anagram
+
+**Problem Number:** 242
+**Difficulty:** Easy
+**Category:** 
+
+## Problem Description
+
+## My Approach
+
+## Solution
+
+## Time & Space Complexity
+
+## Key Insights
+
+## Mistakes Made
+
+## Related Problems
+
+---
+*Note: This is a work in progress. I'll add more details as I reflect on this problem.*