update CODEOWNERS file (#770)

Adds a new group to CODEOWNERS as global owner, and CREs for .md files.

.github/CODEOWNERS

@@ -1 +1,17 @@
-* @replicatedhq/day2
+# Lines starting with '#' are comments.
+# Each line is a file pattern followed by one or more owners.
+
+# More details are here: https://help.github.com/articles/about-codeowners/
+
+# The '*' pattern is global owners.
+
+# Order is important. The last matching pattern has the most precedence.
+# The folders are ordered as follows:
+
+# In each subsection folders are ordered first by depth, then alphabetically.
+# This should make it easy to add new rules without breaking existing ones.
+
+## RULES 
+
+* @replicatedhq/troubleshoot
+*.md @replicatedhq/cre