create MAINTAINERS.md file (#58)

* create MAINTAINERS.md file

* fix project name

MAINTAINERS.md

@@ -0,0 +1,13 @@
+# Maintainers
+
+Maintainers are approvers who have shown good technical judgement in guiding feature design & development, have 
+displayed overall knowledge of the project and features in the project, and are nurturing and receptive to everyone in 
+the community.
+
+The following table lists the CEL Playground project core maintainers:
+
+| Name                                                              | GitHub ID                                        | Affiliation                |
+|-------------------------------------------------------------------|--------------------------------------------------|----------------------------|
+| [Matheus Moraes](https://www.linkedin.com/in/matheusfm/)          | [@matheusfm](https://github.com/matheusfm)       | [Getup](https://getup.io/) |
+| [Kevin Conner](https://www.linkedin.com/in/kevin-conner-26b5554/) | [@knrc](https://github.com/knrc)                 | [Getup](https://getup.io/) |
+| [João Victor](https://www.linkedin.com/in/joaovictordb/)          | [@joaovictor3g](https://github.com/joaovictor3g) | [Getup](https://getup.io/) |