Add LICENSE and README.md

LICENSE

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+Copyright (c) 2011 Sam Stephenson
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# rbenv-vars
+
+This is a plugin for [rbenv](https://github.com/sstephenson/rbenv.git)
+that lets you set global and project-specific environment variables
+before spawning Ruby processes.
+
+## Installation
+
+To install rbenv-vars, clone this repository into your
+`~/.rbenv/plugins` directory. (You'll need a recent version of rbenv
+that supports plugin bundles.)
+
+    $ mkdir -p ~/.rbenv/plugins
+    $ cd ~/.rbenv/plugins
+    $ git clone https://github.com/sstephenson/rbenv-vars.git
+
+## Usage
+
+Define environment variables in an `.rbenv-vars` file in your project,
+one variable per line, in the format `VAR=value`. For example:
+
+    RUBY_GC_MALLOC_LIMIT=50000000
+    RUBY_HEAP_FREE_MIN=4096
+    RUBY_GC_MALLOC_LIMIT=50000000
+    RUBY_FREE_MIN=4096
+
+You can perform variable substitution with the traditional `$`
+syntax. For example, to append to `GEM_PATH`:
+
+    GEM_PATH=$GEM_PATH:/u/shared/gems
+
+Spaces are allowed in values; quoting is not necessary. Expansion and
+command substitution are not allowed. Lines beginning with `#` or any
+lines not in the format VAR=value will be ignored.
+
+Variables specified in the `~/.rbenv/vars` file will be set
+first. Then variables specified in `.rbenv-vars` files in any parent
+directories of the current directory will be set. Variables from the
+`.rbenv-vars` file in the current directory are set last.
+
+Use the `rbenv vars` command to print all environment variables in the
+order they'll be set.
+
+## License
+
+© 2011 Sam Stephenson. Released under the MIT license. See
+`LICENSE` for details.