Add .plugin file and installation instructions for Oh My Zsh (#104).

Makefile

@@ -17,9 +17,11 @@ HEADER_FILES := \
 	LICENSE
 
 PLUGIN_TARGET := zsh-autosuggestions.zsh
+OH_MY_ZSH_LINK_TARGET := zsh-autosuggestions.plugin.zsh
 
 ALL_TARGETS := \
-	$(PLUGIN_TARGET)
+	$(PLUGIN_TARGET) \
+	$(OH_MY_ZSH_LINK_TARGET)
 
 all: $(ALL_TARGETS)
 
@@ -27,6 +29,9 @@ $(PLUGIN_TARGET): $(HEADER_FILES) $(SRC_FILES)
 	cat $(HEADER_FILES) | sed -e 's/^/# /g' >> $@
 	cat $(SRC_FILES) >> $@
 
+$(OH_MY_ZSH_LINK_TARGET): $(PLUGIN_TARGET)
+	ln -s $(PLUGIN_TARGET) $@
+
 .PHONY: clean
 clean:
 	rm $(ALL_TARGETS)

README.md

@@ -24,6 +24,23 @@ It suggests commands as you type, based on command history.
 3. Start a new terminal session.
 
 
+### Oh My Zsh
+
+1. Clone this repository into `$ZSH_CUSTOM/plugins` (by default `~/.oh-my-zsh/custom/plugins`)
+
+    ```sh
+    git clone git://github.com/tarruda/zsh-autosuggestions $ZSH_CUSTOM/plugins/zsh-autosuggestions
+    ```
+
+2. Add the plugin to the list of plugins for Oh My Zsh to load:
+
+    ```sh
+    plugins=(zsh-autosuggestions)
+    ```
+
+3. Start a new terminal session.
+
+
 ## Usage
 
 As you type commands, you will see a completion offered after the cursor in a muted gray color. This color can be changed by setting the `ZSH_AUTOSUGGEST_HIGHLIGHT_STYLE` variable. See [configuration](#configuration).
@@ -37,6 +54,8 @@ If you invoke the `forward-word` widget, it will partially accept the suggestion
 
 You may want to override the default global config variables after sourcing the plugin. Default values of these variables can be found [here](src/config.zsh).
 
+**Note:** If you are using Oh My Zsh, you can put this configuration in a file in the `$ZSH_CUSTOM` directory. See their comments on [overriding internals](https://github.com/robbyrussell/oh-my-zsh/wiki/Customization#overriding-internals).
+
 
 ### Suggestion Highlight Style
 

zsh-autosuggestions.plugin.zsh

@@ -0,0 +1 @@
+zsh-autosuggestions.zsh