update docs

Author: lvm

README.md

@@ -4,6 +4,8 @@ The goal of this project is to provide a visual overview of a Go project using a
 
 ## Usage
 
+### `go-code-tree`
+
 ```
 go-code-tree -h
 Usage of go-code-tree:
@@ -17,22 +19,52 @@ Usage of go-code-tree:
         Show third-party imports
 ```
 
-### Color references
+#### Color references
 
 * Third party dependencies have a light brown/subtle orange tint (burlywood and seashell), which is the default color for each node.
 * Go code have a greenish tint (seagreen and mintcream)
 * Dependencies/directories have a bright orange/yellow tint (orange and lightyellow)
 
 Refer to the [Example](#example) for a clear picture.
 
+### `go-code-tree-fn`
+
+```
+go-code-tree-fn -h
+Usage of go-code-tree-fn:
+  -dir string
+        Directory of the Go project to scan code (default "./")
+  -mocks
+        Scan mock files
+  -tests
+        Scan test files
+```
+#### Color references
+
+* Directories have a light bright orange/yellow tint (orange and lightyellow)
+* Go code have a greenish tint (seagreen and mintcream)
+* Functions (func, methods and constructors) have a blueish tint (dodgerblue4 and aliceblue)
+
+Refer to the [Example](#example) for a clear picture.
+
 ## Build
 
+### `go-code-tree-fn`
+
 ```
-go build -ldflags "-s -w" -o go-code-tree .
+go build -ldflags "-s -w" -o go-code-tree cmd/go-code-tree-imp/main.go
+```
+
+### `go-code-tree-fn`
+
+```
+go build -ldflags "-s -w" -o go-code-tree-fn cmd/go-code-tree-fn/main.go
 ```
 
 ## Example 
 
+### `go-code-tree`
+
 When running the script allowing third party dependencies (see [Suggested dependencies](#suggested-dependencies)): 
 ```
 $ go-code-tree -dir go-code-tree -third | dot -Tpng -ogct.gv.png
@@ -42,11 +74,25 @@ It'll generate this diagram:
 
 ![](media/gct.gv.png)
 
+
+### `go-code-tree-fn`
+
+When running the script with no args (see [Suggested dependencies](#suggested-dependencies)): 
+```
+$ go-code-tree-fn -dir go-code-tree | dot -Tpng -ogct.gv.png
+```
+
+It'll generate this diagram:
+
+![](media/gctf.gv.png)
+
+> Note: In this diagram, you'll see that `go-code-tree-imp` and `go-code-tree-fn` point to the same file, which might not seem ok but this is the default behavior in graphviz when creating diagrams with nodes with similar name.
+
 ## Suggested dependencies
 
 * [Graphviz](https://graphviz.org/)
 
-It's not required to have it installed to use this tool, because `go-code-tree` only prints diagrams, but it's useful to have `graphviz` installed to _see_ the diagram.
+It's not required to have it installed to use this tool, because `go-code-tree{,-fn}` only prints diagrams, but it's useful to have `graphviz` installed to _see_ the diagram.
 
 ### macOS