Update and rename helperAnnotation.md to helper_annotation.md

Author: DeveloperTryingToCodeLikeOtherOfThem

docs/helperAnnotation.md

@@ -0,0 +1,18 @@
+## Help Annotation
+The //% helper annotation links an exported function to a runtime helper in a namespace, 
+so calls to the exported function are replaced with the helper’s implementation at compile time.
+
+## Dealing with Help
+1. Make sure you first write `github:`, so MakeCode knows to fetch a repository on GitHub
+2. Write the repository's name **without any spaces after writing the colon**
+3. Add a slash command to tell the compiler to read a specific file in the repository
+4. If it is a folder in a repository, write the folder's name and then another slash command
+5. Finally, add the file's name (**the file's path must be right or it will not be load**)
+6. Also, make sure to **not** add .md in the end of the file path because MakeCode already reads doc files as markdown files.
+
+Here is a snippet showing how to use the helper annotation correctly.
+``` ts 
+//% help=github:pxt-hardware-programming-docs/docs/_getFactoryInstance
+function _getFactoryInstance() { }
+_getFactoryInstance() 
+```