docs(generators:directive): create directive.md

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Author: Awk34

docs/generators/directive.md

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+### Directive
+Generates a directive.
+
+Example:
+```bash
+yo angular-fullstack:directive myDirective
+[?] Where would you like to create this directive? client/app/
+[?] Does this directive need an external html file? Yes
+```
+
+Produces:
+
+    client/app/myDirective/myDirective.directive.js
+    client/app/myDirective/myDirective.directive.spec.js
+    client/app/myDirective/myDirective.html
+    client/app/myDirective/myDirective.scss
+
+**Simple directive without an html file**
+
+Example:
+```bash
+yo angular-fullstack:directive simple
+[?] Where would you like to create this directive? client/app/
+[?] Does this directive need an external html file? No
+```
+
+Produces:
+
+    client/app/simple/simple.directive.js
+    client/app/simple/simple.directive.spec.js