Update usage.rst

docs/usage.rst

@@ -52,3 +52,30 @@ Exceptions
 
 .. autoexception:: ytubeinsight.YTubeInsightError
    :members:
+
+Getting a YouTube Data API Key
+------------------------------
+
+To use YTubeInsight, you need a YouTube Data API key. Here's how to get one:
+
+1. Go to the `Google Developers Console <https://console.developers.google.com/>`_.
+2. Create a new project or select an existing one.
+3. Enable the YouTube Data API v3 for your project.
+4. Create credentials (API key) for your project.
+5. Use this API key in your YTubeInsight calls.
+
+Remember to keep your API key secret and never share it publicly.
+
+Error Handling
+--------------
+
+YTubeInsight uses custom exceptions to handle errors. Here's an example of how to handle errors:
+
+.. code-block:: python
+
+    from ytubeinsight import analyze_channel, YTubeInsightError
+
+    try:
+        result = analyze_channel('https://www.youtube.com/channel/UC_x5XG1OV2P6uZZ5FSM9Ttw', API_KEY)
+    except YTubeInsightError as e:
+        print(f"An error occurred: {str(e)}")