Add documentation for initial Gist tools

Author: xodene

README.md

@@ -294,6 +294,8 @@ The following sets of tools are available (all are on by default):
 | `repos` | GitHub Repository related tools |
 | `secret_protection` | Secret protection related tools, such as GitHub Secret Scanning |
 | `users` | GitHub User related tools |
+| `gists` | GitHub Gist related tools |
+
 <!-- END AUTOMATED TOOLSETS -->
 
 ## Tools
@@ -866,6 +868,7 @@ The following sets of tools are available (all are on by default):
 
 </details>
 
+
 <details>
 
 <summary>Users</summary>
@@ -878,6 +881,31 @@ The following sets of tools are available (all are on by default):
   - `sort`: Sort field by category (string, optional)
 
 </details>
+<details>
+
+<summary>Gists</summary>
+
+- **list_gist** - List gists for a user
+  - `username`: GitHub username (omit for authenticated user's gists) (string optional)
+  - `since`: Only gists updated after this time (ISO 8601 timestamp) (string, required)
+  - `page`: Page number (min 1) (number, optional)
+  - `perPage`: Results per page for pagination (min 1, max 100) (number, optional)
+
+- **create_gist** - Create a new gist
+  - `description`: Description of the gist (string, optional)
+  - `filename`: Filename for gist file (string, required)
+  - `content` : Content for gist file (string, required)
+  - `public`: Whether the gist is public (boolean, default: false)
+
+
+- **update_gist** - Update an existing gist
+  - `gist_id`: ID of the gist to update (string, required)
+  - `description`: Description of the gist (string, optional)
+  - `filename`: Filename for gist file (string, required)
+  - `content` : Content for gist file (string, required)
+
+</details>
+
 <!-- END AUTOMATED TOOLS -->
 
 ### Additional Tools in Remote Github MCP Server
@@ -1048,4 +1076,4 @@ The exported Go API of this module should currently be considered unstable, and
 
 ## License
 
-This project is licensed under the terms of the MIT open source license. Please refer to [MIT](./LICENSE) for the full terms.
+This project is licensed under the terms of the MIT open source license. Please refer to [MIT](./LICENSE) for the full terms.