Large updates to docs

gen_singleheader/Readme.md

@@ -1,4 +1,18 @@
+## Navigation
+
+# base
+
+[Top](../Readme.md)
+
+* [docs](../docs/Readme.md)
+
 # Singleheader
 
 Creates a single header file version of the library using `singleheader.cpp`.
 Follows the same convention seen in the gb, stb, and zpl libraries.
+
+If using the library's provided build scripts:
+
+```ps1
+.\build.ps1 <compiler> <debug or omit> singleheader
+```