docs: update MAINTAINERS to a markdown

Signed-off-by: Niladri Halder <[email protected]>

Author: niladrih

MAINTAINERS

@@ -0,0 +1,10 @@
+# Maintainers
+
+<BR>
+
+## Umbrella Project
+
+OpenEBS is an "umbrella project". Every project, repository and file in the OpenEBS organization adopts and follows the policies found in the Community repo umbrella project files.
+<BR>
+
+Please refer to the [OpenEBS Maintainers](https://github.com/openebs/community/blob/HEAD/MAINTAINERS.md).