added aviabird/angularspree and angular/material.angular.io example repos

Author: timonkrebs

test-data/example-repos.txt

@@ -1,3 +1,5 @@
 https://github.com/angular-architects/ngrx-toolkit
 https://github.com/mgechev/angular-realworld-example-app-qucklink
-https://github.com/gothinkster/angular-realworld-example-app
+https://github.com/gothinkster/angular-realworld-example-app
+https://github.com/aviabird/angularspree
+https://github.dev/angular/material.angular.io