Large updates to docs

gen_unreal_engine/Readme.md

@@ -1,3 +1,17 @@
+## Navigation
+
+# base
+
+[Top](../Readme.md)
+
+* [docs](../docs/Readme.md)
+
 # Unreal Engine Version Generator
 
-This generates a variant of gencpp thats compatiable with use as a thirdparty module within a plugin or module of an Unreal Project or the Engine itself.
+This generates a variant of gencpp thats compatiable with use as a thirdparty module within a plugin or module of an Unreal Project or the Engine itself.
+
+If using the library's provided build scripts:
+
+```ps1
+.\build.ps1 <compiler> <debug or omit> unreal
+```