Added proxy plugin.

README.md

@@ -59,7 +59,7 @@ Alternatively, you can preview the themes in your own shell using `BASH_PREVIEW=
 ## Misc
 
 ### Bash Profile Aliases
-Bash it creates a 'reload' alias that makes it convenient to reload
+Bash it creates a `reload` alias that makes it convenient to reload
 your bash profile when you make changes.
 
 ### Prompt Version Control Check
@@ -105,6 +105,37 @@ Unset `BASH_IT_LEGACY_PASS` to have Bash it **return to default behavior**:
 
 * `unset BASH_IT_LEGACY_PASS`
 
+#### Proxy Support
+
+If you are working in a corporate environment where you have to go through a proxy server for internet access, then you know how painful it is to configure the OS proxy variables in the shell, especially if you are switching between environments, e.g. office (with proxy) and home (without proxy).
+
+The Bash shell (and many shell tools) use the following variables to define the proxy to use:
+
+* `HTTP_PROXY` (and `http_proxy`): Defines the proxy server for HTTP requests
+* `HTTPS_PROXY` (and `https_proxy`): Defines the proxy server for HTTPS requests
+* `ALL_PROXY` (and `all_proxy`): Used by some tools for the same purpose as above
+* `NO_PROXY` (and `no_proxy`): Comma-separated list of hostnames that don't have to go through the proxy
+
+Bash it's `proxy` plugin allows to enable and disable these variables with a simple command. To start using the `proxy` plugin, run the following:
+
+```bash
+bash-it enable plugin proxy
+```
+
+Bash it also provides support for enabling/disabling proxy settings for various shell tools. The following backends are currently supported (in addition to the shell's environment variables): Git, SVN, npm, ssh. The `proxy` plugin changes the configuration files of these tools to enable or disable the proxy settings.
+
+Bash-it uses the following variables to set the shell's proxy settings when you call `enable-proxy`.
+These variables are best defined in a custom script in Bash-it's custom script folder (`$BASH_IT/custom`), e.g. `$BASH_IT/custom/proxy.env.bash`
+* `BASH_IT_HTTP_PROXY` and `BASH_IT_HTTPS_PROXY`: Define the proxy URL to be used, e.g. 'http://localhost:1234'
+* `BASH_IT_NO_PROXY`: A comma-separated list of proxy exclusions, e.g. `127.0.0.1,localhost`
+
+Once you have defined these variables (and have run `reload` to load the changes), you can use the following commands to enable or disable the proxy settings in your current shell:
+
+* `enable-proxy`: This sets the shell's proxy environment variables and configures proxy support in your SVN, npm and SSH configuration files.
+* `disable-proxy`: This unsets the shell's proxy environment variables and disables proxy support in your SVN, npm and SSH configuration files.
+
+There are many more proxy commands, e.g. for changing the local Git project's proxy settings. Run `glossary proxy` to show the available proxy functions with a short description.
+
 ## Help out
 
 We think everyone has their own custom scripts accumulated over time.  And so, following in the footsteps of oh-my-zsh, Bash it is a framework for easily customizing your bash shell. Everyone's got a custom toolbox, so let's start making them even better, **as a community!**