Added a State Machine Pattern

[kamalbuilds]

Made the following contributions

1. A State Machine Pattern contract that demonstrates state transitions and stage-based access control.

In Solidity, the State Machine pattern is a design approach that enables a contract to transition through a series of predefined stages, with each stage permitting specific functionalities. This pattern is particularly useful for modeling processes like auctions, crowdfunding, or voting systems, where the contract's behavior evolves over time

2. A new CLI tool to easily add pattern contracts to projects

3. Integration of the pattern creation tool into the main CLI

To use these patterns, developers can:

Use the CLI command: npm run create-pattern <pattern-name>
Available patterns: access, state, rate, guard, proxy, check

The patterns will be created in a contracts/patterns directory
These additions would make the repository more valuable for developers by providing:

• More design patterns and examples
• Better tooling for pattern implementation
• Structured approach to common smart contract patterns
• Educational value for blockchain developers

[kamalbuilds]

@0xAleksaOpacic please review this PR