Add documentation into lldb/tools/lldb-dap/README.md

Author: royitaqi

lldb/tools/lldb-dap/README.md

@@ -275,9 +275,9 @@ User settings can set the default value for the following supported
 | **exitCommands**                  | [string] |  `[]`   |
 | **terminateCommands**             | [string] |  `[]`   |
 
-To adjust your settings, open the Settings editor via the 
-`File > Preferences > Settings` menu or press `Ctrl+`, on Windows/Linux and
-`Cmd+`, on Mac.
+To adjust your settings, open the Settings editor
+via the `File > Preferences > Settings` menu or press `Ctrl+,` on Windows/Linux,
+and the `VS Code > Settings... > Settings` menu or press `Cmd+,` on Mac.
 
 ## Debug Console
 
@@ -372,6 +372,19 @@ for more details on Debug Adapter Protocol events and the VS Code
 [debug.onDidReceiveDebugSessionCustomEvent](https://code.visualstudio.com/api/references/vscode-api#debug.onDidReceiveDebugSessionCustomEvent)
 API for handling a custom event from an extension.
 
+## Server Mode
+
+lldb-dap supports a server mode that can be enabled via the following user settings.
+
+| Setting                    | Type     | Default |           |
+| -------------------------- | -------- | :-----: | --------- |
+| **Server Mode**            | string   | `False` | Run lldb-dap in server mode. When enabled, lldb-dap will start a background server that will be reused between debug sessions. This allows caching of debug symbols between sessions and improves launch performance.
+| **Connection Timeout**     | number   |   `0`   | When running lldb-dap in server mode, the time in seconds to wait for new connections after the server has started and after all clients have disconnected. Each new connection will reset the timeout. When the timeout is reached, the server will be closed and the process will exit. Specifying non-positive values will cause the server to wait for new connections indefinitely.
+
+To adjust your settings, open the Settings editor
+via the `File > Preferences > Settings` menu or press `Ctrl+,` on Windows/Linux,
+and the `VS Code > Settings... > Settings` menu or press `Cmd+,` on Mac.
+
 ## Contributing
 
 `lldb-dap` and `lldb` are developed under the umbrella of the [LLVM project](https://llvm.org/).