Selfishly add myself and Pieter to CODEOWNERS

Summary:
Trivial changes in CODEOWNERS.
Closes https://github.com/facebook/react-native/pull/15092

Differential Revision: D5452441

Pulled By: shergin

fbshipit-source-id: c9b33750a69f944a6d4eff16233f35ef6ef8bc6c

.github/CODEOWNERS

@@ -2,7 +2,15 @@ docs/* @facebook/react-native
 blog/* @facebook/react-native
 Libraries/Animated/* @janicduplessis
 Libraries/NativeAnimation/* @janicduplessis
+Libraries/Image/* @shergin
+Libraries/Text/* @shergin
+React/Base/* @shergin @javache
+React/Views/* @shergin @javache
+React/Modules/* @shergin @javache
+React/CxxBridge/* @javache
+React/Executors/* @javache
 ReactAndroid/src/main/java/com/facebook/react/animated/* @janicduplessis
+ReactCommon/* @javache
 website/* @facebook/react-native
 website/showcase.json @facebook/react-native
 package.json @facebook/react-native