Add "SimpleT" t output form

This new output form allows easy piping to the decode function of the
tricu executable. Includes a new test for roundtrip evaluation of map,
compilation to tree calculus terms, and decoding back to a human
readable string.

README.md

@@ -46,14 +46,42 @@ tricu < map (\i : listConcat i " is super cool!") [("Tree Calculus") ("Intension
 READ -: ["Tree Calculus is super cool!", "Intensionality is super cool!", "tricu is super cool!"]
 ```
 
-## Installation
+## Installation and Use
 
 You can easily build and/or run this project using [Nix](https://nixos.org/download/).
 
-- Run REPL immediately: 
+- Quick Start (REPL): 
   - `nix run git+https://git.eversole.co/James/tricu`
-- Build REPL executable in `./result/bin`: 
+- Build executable in `./result/bin`: 
   - `nix build git+https://git.eversole.co/James/tricu`
+  - `./result/bin/tricu --help`
+
+```
+tricu - compiler and repl
+
+tricu [COMMAND] ... [OPTIONS]
+  tricu: Exploring Tree Calculus
+
+Common flags:
+  -? --help           Display help message
+  -V --version        Print version information
+
+tricu [repl] [OPTIONS]
+  Start interactive REPL
+
+tricu compile [OPTIONS]
+  Compile a file and return the result of the expression in the final line
+
+  -f --file=FILE      Relative or absolute path to file input for compilation
+  -o --output=OUTPUT  Optional output file path for resulting output
+  -t --form=FORM      Output form: (tree|ast|ternary|ascii)
+
+tricu decode [OPTIONS]
+  Decode a Tree Calculus value into a string representation
+
+  -f --input=FILE     Optional file path containing a Tree Calculus value.
+                      Defaults to stdin.
+```
 
 ## Acknowledgements