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Add Two Pointers technique documentation #8

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Add comprehensive Two Pointers technique documentation
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7 changes: 7 additions & 0 deletions docs/README.md
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- Maintain a window over an array/string while expanding and shrinking based on constraints.
- Used for longest substring problems, frequency constraints, and streaming aggregates.
- [Technique Details](techniques/SLIDING_WINDOW.md)

### Two Pointers Technique

- Use two pointers to traverse data structures efficiently, eliminating nested loops.
- **Opposite Direction**: Pointers start at opposite ends and converge (e.g., Two Sum, palindrome checking).
- **Same Direction**: Pointers move in parallel at different speeds (e.g., remove duplicates, fast/slow cycle detection).
- [Technique Details](techniques/TWO_POINTERS.md)
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