Updated FileTreeDocumentation (markdown)

FileTreeDocumentation.md

@@ -1,5 +1,45 @@
 # Go project directory layout
-```
-/
-```
 
+The Go project itself contains a number of subdirectories. This document will provide a brief overview, but many of these directories have individual README.md or README files that describe their purpose in detail. 
+
+- [api](#api)
+- [bin](#bin)
+- [blog](#blog)
+- [doc](#doc)
+- [lib](#lib)
+- [misc](#misc)
+- [pkg](#pkg)
+- [src](#src)
+- [test](#test)
+
+## api
+
+The `api` directory contains machine checkable specifications for the Go standard library, to help enforce the [Go 1 compatibility promise](https://golang.org/doc/go1compat).
+
+## bin
+
+The `bin` directory contains the binaries of the project: `go`, `godoc`, and `gofmt`.
+
+## blog
+
+The `blog` directory contains the source and templates for [the Go blog](https://blog.golang.org/). However, the code for serving the blog is at https://godoc.org/golang.org/x/blog
+
+## doc
+
+The `doc` directory contains the resources served at https://golang.org/doc/
+
+## lib
+
+The `lib` directory contains a single subdirectory `lib/time` which contains a copy of the time zone database that Go uses if it cannot find the operating systems copy.
+
+## misc
+
+## pkg
+
+## src
+
+The `src` directory contains the source code for the standard library and, in `src/cmd`, tool chain.
+
+## test
+
+The `test` directory contains extensive additional tests for the runtime and tool chain.