Updating the maintainers list (#4696)

Signed-off-by: Maksim Nabokikh <maksim.nabokikh@flant.com>

Author: nabokihms

MAINTAINERS

@@ -0,0 +1,25 @@
+# Dex Maintainers
+
+The current Maintainers Group for the Dex Project consists of:
+
+| Name | GitHub | Employer | Responsibilities |
+| ---- | ------ | -------- | ---------------- |
+| Maksim Nabokikh | [@nabokihms](https://github.com/nabokihms) | [Palark GmbH](https://palark.de/) | ALL |
+| Márk Sági-Kazár | [@sagikazarmark](https://github.com/sagikazarmark) | <!-- TODO: employer --> | ALL |
+
+This list must be kept in sync with the [CNCF Project Maintainers list](https://github.com/cncf/foundation/blob/master/project-maintainers.csv).
+
+<!-- TODO (nabokihms): Add the Governance
+See [the project Governance](./GOVERNANCE.md) for how maintainers are selected and replaced.
+-->
+
+## Emeritus Maintainers
+
+We are grateful to our former maintainers for their contributions to the Dex project.
+
+- [@ericchiang](https://github.com/ericchiang) - Eric Chiang
+- [@JoelSpeed](https://github.com/JoelSpeed) - Joel Speed
+- [@bonifaido](https://github.com/bonifaido) - Nandor Kracser
+- [@rithujohn191](https://github.com/rithujohn191) - Rithu John
+- [@justaugustus](https://github.com/justaugustus) - Stephen Augustus
+- [@srenatus](https://github.com/srenatus) - Stephan Renatus