chore: update readme install cmd (#11)

Author: averikitsch

README.md

@@ -17,7 +17,7 @@ Learn more about [Gemini CLI Extensions](https://github.com/google-gemini/gemini
 
 Before you begin, ensure you have the following:
 
-* [Gemini CLI](https://github.com/google-gemini/gemini-cli) installed with version +v0.6.0.
+* [Gemini CLI](https://github.com/google-gemini/gemini-cli) installed with version **+v0.6.0**.
 * A running SQL Server instance.
 * A user with database-level permissions to execute queries.
 
@@ -26,7 +26,7 @@ Before you begin, ensure you have the following:
 To install the extension, use the command:
 
 ```bash
-gemini extensions install github.com/gemini-cli-extensions/sql-server
+gemini extensions install https://github.com/gemini-cli-extensions/sql-server
 ```
 
 ## Configuration