add the angularapp template

Add the newly created angularpp template into stagehand (thanks @laco0416 !).

I do see an issue on my machine:
```
Loading angular transformers... (1.6s)
Error on line 15, column 3 of pubspec.yaml: Error loading transformer: Illegal argument(s): sdkDirectory must be provided.
- angular
  ^^^^^^^
```
Which, I was not able to solve by setting the `sdk_dir` setting on the angular transformer. Do not know why. I _was_ able to get the app running by removing the angular transformer and changing the di method over to a dynamic one. The compiled output for the app ballooned up a bit (~3MB).

In any case, @sethladd, let me know what you think.