Update Python.gitignore file header

Added header to python gitignore file for when a user copies the file into their project they know where to get update results later. Especially useful for new developers wondering where the previous developer got all the base information.

Python.gitignore

@@ -1,3 +1,8 @@
+## Ignore Python temporary files, build results, and
+## files generated by popular Python add-ons.
+##
+## Get latest from https://github.com/github/gitignore/blob/main/Python.gitignore
+
 # Byte-compiled / optimized / DLL files
 __pycache__/
 *.py[cod]