Create an initial maintainers list

As part of https://github.com/cncf/toc/issues/854

maintainers.md

@@ -0,0 +1,15 @@
+# OpenCost Maintainers
+
+Official list of OpenCost Maintainers.
+
+Please keep the below list sorted in ascending order.
+
+## Maintainers
+
+| Maintainer | GitHub ID | Affiliation | Email |
+| --------------- | --------- | ----------- | ----------- |
+| Ajay Tripathy | @AjayTripathy | Kubecost | <Ajay@kubecost.com> |
+| Matt Bolt | @​​mbolt35 | Kubecost | <matt@kubecost.com> |
+| Michael Dresser | @michaelmdresser | Kubecost | <michael@kubecost.com > |
+| Niko Kovacevic | @nikovacevic | Kubecost | <niko@kubecost.com > |
+| Sean Holcomb | @Sean-Holcomb | Kubecost | <Sean@kubecost.com> |