Add README.md for Apps Script snippets

apps-script/snippets/README.md

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+# Apps Script Code Snippets
+
+The `youtube-data-api.gs` file in this directory contains code snippets that are generated
+by the Data API code snippet tool at:
+https://developers.google.com/youtube/v3/code_samples/code_snippets
+
+You can use that tool to test different parameter values and to generate code samples with
+those modified parameter values. The tool generates code for several other programming
+languages as well.
+
+Each function in the file demonstrates a particular use case for a particular API method.
+For example, there are several different use cases for calling the `search.list()` method,
+such as searching by keyword or searching for live events.
+
+In addition to the use-case-specific functions, the file also contains some boilerplate code
+that prints some data from an API response to the logging console. The print function is
+currently designed just to show that each API response returns data and serves as a placeholder
+for any function that would actually process an API response.
+
+## Running these samples
+
+To run these samples:
+
+1. Create a spreadsheet in [Google Drive](https://spreadsheets.google.com).
+2. Select **Tools > Script Editor** from the menu bar.
+3. Paste this code into the script editor and save your file.
+4. In the script, select **Resources > Advanced Google Services** and toggle the option for the
+   YouTube Data API to on.
+5. Click the link to the Google Developers Console and enable the YouTube Data API for the project.
+6. Go back to the script editor and click 'OK' to indicate that you have finished enabling advanced services.
+7. Run the `Main` function in your script.
+8. Select **View > Logs** to see the output from the script.