Help text and README

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   _(This project is at a very early stage, but please feel free to open issues.)_
 
+## Usage
+```
+delta 0.1.0
+Dan Davison <dandavison7@gmail.com>
+Adds language-specific syntax highlighting to git output. Use 'delta | less -R' as core.pager in .gitconfig
+
+USAGE:
+    delta [FLAGS] [OPTIONS]
+
+FLAGS:
+        --dark       Use diff highlighting colors appropriate for a dark terminal background.
+    -h, --help       Prints help information
+        --light      Use diff highlighting colors appropriate for a light terminal background. This is the default.
+    -V, --version    Prints version information
+
+OPTIONS:
+        --minus-color <minus_color>    The background color (RGB hex) to use for removed lines. The default is "#ffd0d0"
+                                       if you are using --light, and "#3f0001" if you are using --dark.
+        --plus-color <plus_color>      The background color (RGB hex) to use for added lines. The default is "#d0ffd0"
+                                       if you are using --light, and "#013B01" if you are using --dark.
+        --theme <theme>                The syntax highlighting theme to use. Options are Light: ("InspiredGitHub",
+                                       "Solarized (light)", "base16-ocean.light"), Dark: ("Solarized, (dark)", "base16-
+                                       eighties.dark", "base16-mocha.dark", "base16-ocean.dark").
+    -w, --width <width>                The width (in characters) of the diff highlighting. By default, the highlighting
+                                       extends to the last character on each line
+```
+
 ## Installation
 
 #### 0. Use a terminal that supports 24 bit colors