Add CODEOWNERS

.github/CODEOWNERS

@@ -0,0 +1,7 @@
+# https://help.github.com/articles/about-codeowners/
+# please keep this file in the same order as packages
+
+src/main/java/org/spongepowered/api/boss/** @kashike
+src/main/java/org/spongepowered/api/profile/** @kashike
+src/main/java/org/spongepowered/api/text/** @kashike @minecrell
+src/main/java/org/spongepowered/api/world/gamerule/** @kashike