contrib: add editmerge version for powershell
This just adds a translation of existing contrib/editmerge to powershell.
It allows users on Windows to iteratively resolve conflicts in their
editor of choice.
# no-check-commit
# See http://EditorConfig.org for the specification
root = true
[*.py]
indent_size = 4
indent_style = space
trim_trailing_whitespace = true
[*.{c,h}]
indent_size = 8
indent_style = tab
trim_trailing_whitespace = true