README: add installation instructions; closes #6

Author: sunaku

README.md

@@ -13,6 +13,23 @@ typing more shortcut keys or parts of shortcut descriptions shown in the menu.
 
 * [fzf.vim] plugin.
 
+## Installation
+
+1. Clone this Git repository as follows, or [download and extract its
+   contents]( https://github.com/sunaku/vim-shortcut/archive/master.zip ).
+
+        git clone https://github.com/sunaku/vim-shortcut.git ~/vim-shortcut
+
+2. Run the following commands in Vim to start using this plugin immediately,
+   or add them to your *vimrc* file to automate this whenever you start Vim.
+
+        :set runtimepath+=~/vim-shortcut
+        :runtime plugin/shortcut.vim
+
+3. Run the following command inside Vim to learn more about using this plugin.
+
+        :help shortcut.vim
+
 ## Usage
 
 * Use the `Shortcut!` prefix (with a bang) to describe existing shortcuts.
@@ -130,7 +147,7 @@ Any extra whitespace is ignored.
 
 ## Documentation
 
-Run `:help shortcut` or see the `doc/shortcut.txt` file.
+Run `:help shortcut.vim` or see the `doc/shortcut.txt` file.
 
 ## Testing
 

doc/shortcut.txt

@@ -17,6 +17,28 @@ to discover what else is available.  You can interactively filter the menu by
 typing more shortcut keys or parts of shortcut descriptions shown in the menu.
 
 
+------------------------------------------------------------------------------
+INSTALLATION                                                *shortcut-install*
+------------------------------------------------------------------------------
+
+1. Clone this plugin's Git repository as follows, or download and extract its
+   contents from <https://github.com/sunaku/vim-shortcut/archive/master.zip>.
+>
+        git clone https://github.com/sunaku/vim-shortcut.git ~/vim-shortcut
+<
+
+2. Run the following commands in Vim to start using this plugin immediately,
+   or add them to your |vimrc| file to automate this whenever you start Vim.
+>
+        :set runtimepath+=~/vim-shortcut
+        :runtime plugin/shortcut.vim
+<
+
+3. Run the following command inside Vim to learn more about using this plugin.
+>
+        :help shortcut.vim
+<
+
 ------------------------------------------------------------------------------
 USAGE                                                         *shortcut-usage*
 ------------------------------------------------------------------------------

doc/tags

@@ -0,0 +1,15 @@
+:Shortcut	shortcut.txt	/*:Shortcut*
+:Shortcut!	shortcut.txt	/*:Shortcut!*
+:Shortcuts	shortcut.txt	/*:Shortcuts*
+:Shortcuts!	shortcut.txt	/*:Shortcuts!*
+:ShortcutsRangeless	shortcut.txt	/*:ShortcutsRangeless*
+:ShortcutsRangeless!	shortcut.txt	/*:ShortcutsRangeless!*
+g:shortcuts	shortcut.txt	/*g:shortcuts*
+g:shortcuts_overwrite_warning	shortcut.txt	/*g:shortcuts_overwrite_warning*
+shortcut-cmd	shortcut.txt	/*shortcut-cmd*
+shortcut-install	shortcut.txt	/*shortcut-install*
+shortcut-intro	shortcut.txt	/*shortcut-intro*
+shortcut-setup	shortcut.txt	/*shortcut-setup*
+shortcut-usage	shortcut.txt	/*shortcut-usage*
+shortcut-var	shortcut.txt	/*shortcut-var*
+shortcut.vim	shortcut.txt	/*shortcut.vim*