add code snippets for escu 6 ymls

[pyth0n1c]

With code snippets, when you want to create a new piece of content, just

1. Open VSCode or similar editor.
2. Right click to create a new file, for example in detections/endpoint or macros/
3. enter the name of the file. It should open automatically.
4. Start typing the name of the content. For instance, if you start typing detection... you will see the following:

5. Hit ENTER and it will auto populate the YML file for you!