Preliminary docs for quasiquotes

review @xeno-by 
There is a possiblity of unification between Parent and Annot. 
```
val cx = mod"@C(x)" 
q"class D extends $cx"
q"$parent def foo"
```
or:
```
val parent = templ"C(x)"
q"class D extends $parent"
q"@$parent def foo"
```