docs: improve documentation with new sections and better readability (#12)

- Add a "What is Gitea?" section explaining Gitea
- Add a "What is MCP?" section describing Model Context Protocol
- Reformat the MCP server configuration instructions for better readability
- Correct the markdown table for tool support
- Add a Troubleshooting section with common steps to resolve issues

Signed-off-by: appleboy <appleboy.tw@gmail.com>

Reviewed-on: https://gitea.com/gitea/gitea-mcp/pulls/12
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: appleboy <appleboy.tw@gmail.com>
Co-committed-by: appleboy <appleboy.tw@gmail.com>

README.md

@@ -2,6 +2,14 @@
 
 **Gitea MCP Server** is an integration plugin designed to connect Gitea with Model Context Protocol (MCP) systems. This allows for seamless command execution and repository management through an MCP-compatible chat interface.
 
+## What is Gitea?
+
+Gitea is a community-managed lightweight code hosting solution written in Go. It is published under the MIT license. Gitea provides Git hosting including a repository viewer, issue tracking, pull requests, and more.
+
+## What is MCP?
+
+Model Context Protocol (MCP) is a protocol that allows for the integration of various tools and systems through a chat interface. It enables seamless command execution and management of repositories, users, and other resources.
+
 ## 🚧 Installation
 
 ### 📥 Download the official binary release
@@ -48,8 +56,10 @@ To configure the MCP server for Gitea, add the following to your MCP configurati
     "gitea": {
       "command": "gitea-mcp",
       "args": [
-        "-t", "stdio",
-        "--host", "https://gitea.com"
+        "-t",
+        "stdio",
+        "--host",
+        "https://gitea.com"
         // "--token", "<your personal access token>"
       ],
       "env": {
@@ -88,7 +98,7 @@ list all my repositories
 The Gitea MCP Server supports the following tools:
 
 |             Tool             |    Scope     |                      Description                      |
-|:------:|:-------:|:------------:|
+| :--------------------------: | :----------: | :---------------------------------------------------: |
 |       get_my_user_info       |     User     |     Get the information of the authenticated user     |
 |         create_repo          |  Repository  |                Create a new repository                |
 |          fork_repo           |  Repository  |                   Fork a repository                   |
@@ -121,4 +131,13 @@ To enable debug mode, add the `-d` flag when running the Gitea MCP Server with s
 ./gitea-mcp -t sse [--port 8080] --token <your personal access token> -d
 ```
 
+## 🛠 Troubleshooting
+
+If you encounter any issues, here are some common troubleshooting steps:
+
+1. **Check your PATH**: Ensure that the `gitea-mcp` binary is in a directory included in your system's PATH.
+2. **Verify dependencies**: Make sure you have all the required dependencies installed, such as `make` and `Golang`.
+3. **Review configuration**: Double-check your MCP configuration file for any errors or missing information.
+4. **Consult logs**: Check the logs for any error messages or warnings that can provide more information about the issue.
+
 Enjoy exploring and managing your Gitea repositories via chat!