Write README

README.md

@@ -32,9 +32,10 @@ read("examples/assets/faithful.csv")
   - [Features](#features)
   - [Usage](#usage)
   - [Installation](#installation)
+  - [Contributing](#contributing)
   - [The Dust Programming Language](#the-dust-programming-language)
     - [Variables and Data Types](#variables-and-data-types)
-    - [Commands](#commands)
+    - [Tools](#tools)
     - [Lists](#lists)
     - [Maps](#maps)
     - [Tables](#tables)
@@ -56,6 +57,15 @@ read("examples/assets/faithful.csv")
 
 Dust is an experimental project under active development. At this stage, features come and go and the API is always changing. It should not be considered for serious use yet.
 
+To get help with the shell you can use the "help" tool.
+
+```dust
+help()         # Returns a table will all tool info.
+help("random") # Returns a table with info on tools in the specified group.
+# The above is simply a shorthand for this:
+help() -> where(input, 'tool == "random"')    
+```
+
 ## Installation
 
 You must have the default rust toolchain installed and up-to-date. Install [rustup] if it is not already installed. Run `cargo install dust-lang` then run `dust` to start the interactive shell. Use `dust --help` to see the full command line options.
@@ -98,9 +108,9 @@ map.key = "value";
 empty = ();
 ```
 
-### Commands
+### Tools
 
-**Commands** are dust's built-in tools. Some of them can reconfigure your whole system while others are do very little. They may accept different inputs, or none at all. commands in the `random` group can be run without input, but the `random_integer` command can optionally take two numbers as in inclusive range.
+**Tools** are dust's built-in functions. Some of them can reconfigure your whole system while others do very little. They may accept different inputs, or none at all. For example, commands in the `random` group can be run without input, but the `random_integer` command can optionally take two numbers as in inclusive range.
 
 ```dust
 die_roll = random_integer(1, 6);
@@ -108,11 +118,9 @@ d20_roll = random_integer(1, 20);
 coin_flip = random_boolean();
 ```
 
-Other commands can be found by pressing TAB in the interactive shell.
-
 ```dust
 message = "I hate dust.";
-replace(message, "hate", "love");
+replace(message, "hate", "love")
 ```
 
 ### Lists