Add MAINTAINERS.md

Author: oz123

MAINTAINERS.md

@@ -0,0 +1,18 @@
+MAINTAINERS
+===========
+
+This document's purpose is to describe tasks related to the maintainer's work.
+
+
+## Releasing a new version
+
+First, if you have not done so yet:
+
+```
+$ pipenv install -e .[tests,dev]
+```
+
+Then run:
+```
+$inv release
+```