docs: add CONTRIBUTING.md (#275)

Author: pottekkat

CONTRIBUTING.md

@@ -0,0 +1,42 @@
+# Contributing
+
+Thank you for your interest in contributing to the MCP Go SDK! We welcome contributions of all kinds, including bug fixes, new features, and documentation improvements. This document outlines the process for contributing to the project.
+
+## Development Guidelines
+
+### Prerequisites
+
+Make sure you have Go 1.23 or later installed on your machine. You can check your Go version by running:
+
+```bash
+go version
+```
+
+### Setup
+
+1. Fork the repository
+2. Clone your fork:
+   
+   ```bash
+    git clone https://github.com/YOUR_USERNAME/mcp-go.git
+    cd mcp-go
+    ```
+3. Install the required packages:
+
+    ```bash
+    go mod tidy
+    ```
+
+### Workflow
+
+1. Create a new branch.
+2. Make your changes.
+3. Ensure you have added tests for any new functionality.
+4. Run the tests as shown below from the root directory:
+
+    ```bash
+    go test -v './...'
+    ```
+5. Submit a pull request to the main branch.
+
+Feel free to reach out if you have any questions or need help either by [opening an issue](https://github.com/mark3labs/mcp-go/issues) or by reaching out in the [Discord channel](https://discord.gg/RqSS2NQVsY).

README.md

@@ -746,57 +746,3 @@ Add middleware to tool call handlers using the `server.WithToolHandlerMiddleware
 
 A recovery middleware option is available to recover from panics in a tool call and can be added to the server with the `server.WithRecovery` option.
 
-## Contributing
-
-<details>
-
-<summary><h3>Open Developer Guide</h3></summary>
-
-### Prerequisites
-
-Go version >= 1.23
-
-### Installation
-
-Create a fork of this repository, then clone it:
-
-```bash
-git clone https://github.com/mark3labs/mcp-go.git
-cd mcp-go
-```
-
-### Testing
-
-Please make sure to test any new functionality. Your tests should be simple and atomic and anticipate change rather than cement complex patterns.
-
-Run tests from the root directory:
-
-```bash
-go test -v './...'
-```
-
-### Opening a Pull Request
-
-Fork the repository and create a new branch:
-
-```bash
-git checkout -b my-branch
-```
-
-Make your changes and commit them:
-
-
-```bash
-git add . && git commit -m "My changes"
-```
-
-Push your changes to your fork:
-
-
-```bash
-git push origin my-branch
-```
-
-Feel free to reach out in a GitHub issue or discussion if you have any questions!
-
-</details>