Add README with Maven integration and setup instructions

[Copilot]

Adds README.md following MineValley organization standards for API documentation.

Contents

• Brief description: Custom crafting recipes API with shaped/shapeless recipe support and custom durations
• Maven integration: Repository and dependency configuration for minevalley.crafting:api:1.0.0
• GitHub authentication: Token creation and settings.xml configuration walkthrough
• Troubleshooting/FAQ: Common setup issues and resolutions

Mirrors documentation structure from CoreAPI, RegionsAPI, and FastCarAPI for consistency across the organization.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>introducing README</issue_title>
<issue_description></issue_description>

<agent_instructions>Write a brief readme in english language. Get inspired by other READMEs on the MineValley organization, here on Github. Dont get to much into detail</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes introducing README #1

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