docs(time): add explicit uvx command to installation section

The uv installation section mentioned using uvx but didn't show the
actual command, unlike the PIP section which shows both install and run
commands. This adds the missing `uvx mcp-server-time` command.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: shuklaham

src/time/README.md

@@ -23,6 +23,10 @@ A Model Context Protocol server that provides time and timezone conversion capab
 When using [`uv`](https://docs.astral.sh/uv/) no specific installation is needed. We will
 use [`uvx`](https://docs.astral.sh/uv/guides/tools/) to directly run *mcp-server-time*.
 
+```bash
+uvx mcp-server-time
+```
+
 ### Using PIP
 
 Alternatively you can install `mcp-server-time` via pip: