docs(generators:component): add component.md

[skip ci]

Author: Awk34

docs/generators/component.md

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+### Component
+Generates an Angular 1.5 component.
+
+Example:
+```bash
+yo angular-fullstack:component name
+[?] Where would you like to create this component? client/app/
+```
+
+Produces:
+
+    client/app/name/name.component.js
+    client/app/name/name.component.spec.js