add IPoolManager reference guide with mdx formatting

[krisoshea-eth]

This PR introduces a reference guide for the IPoolManager interface in Uniswap V4.

Key Features of the Document:

1. Introduction to the IPoolManager interface and its role in Uniswap V4
2. Detailed explanations of key structures:
   • ModifyLiquidityParams
   • SwapParams
3. Comprehensive breakdown of core methods:
   • initialize
   • unlock
   • modifyLiquidity
   • swap
   • donate
4. For each method:
   • Solidity function signature
   • Description of functionality
   • Table of input parameters
   • Description of return values
5. Important notes on specific behaviors (e.g., fee collection in modifyLiquidity)

Document Structure:

• Uses MDX formatting with frontmatter
• Provides Solidity code snippets for each method
• Includes tables for method parameters
• Follows a consistent format for describing each method and structure

Impact and Importance:

The IPoolManager interface is the primary point of interaction for operations like initializing pools, modifying liquidity, executing swaps, and donating to pools. Understanding these methods is essential for anyone implementing, integrating, or building on top of Uniswap V4.

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