Clarify local build (#264)

Author: rfearing

Diff for: README.md

@@ -91,10 +91,24 @@ More about using MCP server tools in VS Code's [agent mode documentation](https:
 
 ### Build from source
 
-If you don't have Docker, you can use `go` to build the binary in the
-`cmd/github-mcp-server` directory, and use the `github-mcp-server stdio`
-command with the `GITHUB_PERSONAL_ACCESS_TOKEN` environment variable set to
-your token.
+If you don't have Docker, you can use `go build` to build the binary in the
+`cmd/github-mcp-server` directory, and use the `github-mcp-server stdio` command with the `GITHUB_PERSONAL_ACCESS_TOKEN` environment variable set to your token. To specify the output location of the build, use the `-o` flag. You should configure your server to use the built executable as its `command`. For example:
+
+```JSON
+{
+  "mcp": {
+    "servers": {
+      "github": {
+        "command": "/path/to/github-mcp-server",
+        "args": ["stdio"],
+        "env": {
+          "GITHUB_PERSONAL_ACCESS_TOKEN": "<YOUR_TOKEN>"
+        }
+      }
+    }
+  }
+}
+```
 
 ## GitHub Enterprise Server