add LiquidityAmounts Reference guide with mdx formatting

[krisoshea-eth]

This PR adds a reference guide for the LiquidityAmounts library in Uniswap V4.

Key Features of the Document:

1. Introduction to the LiquidityAmounts library and its purpose in Uniswap V4
2. Explanation of the key concept sqrtPriceX96 and its importance in price calculations
3. Detailed breakdown of six core functions in the library:
   • getLiquidityForAmount0
   • getLiquidityForAmount1
   • getLiquidityForAmounts
   • getAmount0ForLiquidity
   • getAmount1ForLiquidity
   • getAmountsForLiquidity
4. For each function:
   • Solidity function signature
   • Description of functionality
   • Table of input parameters
   • Description of return values

Document Structure:

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

Impact and Importance:

The LiquidityAmounts library is fundamental to many core operations in Uniswap, including adding and removing liquidity, and calculating token amounts. Understanding these functions is essential for anyone implementing, integrating, or building on top of Uniswap V4's liquidity management features.

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