Add CONTRIBUTING.md and README.md

CONTRIBUTING.md

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+# Contributing to FBExpect
+We want to make contributing to this project as easy and transparent as
+possible.
+
+## Our Development Process
+
+All development is direclty on GitHub.
+
+## Pull Requests
+We actively welcome your pull requests.
+
+1. Fork the repo and create your branch from `master`.
+2. If you've added code that should be tested, add tests.
+3. If you've changed APIs, update the documentation.
+4. Ensure the test suite passes.
+5. Make sure your code lints.
+6. If you haven't already, complete the Contributor License Agreement ("CLA").
+
+## Contributor License Agreement ("CLA")
+In order to accept your pull request, we need you to submit a CLA. You only need
+to do this once to work on any of Facebook's open source projects.
+
+Complete your CLA here: <https://code.facebook.com/cla>
+
+## Issues
+We use GitHub issues to track public bugs. Please ensure your description is
+clear and has sufficient instructions to be able to reproduce the issue.
+
+Facebook has a [bounty program](https://www.facebook.com/whitehat/) for the safe
+disclosure of security bugs. In those cases, please go through the process
+outlined on that page and do not file a public issue.
+
+## Coding Style
+
+Coding should match `hh_format`/`hackfmt` where practical; the key parts are:
+
+* 2 spaces for indentation rather than tabs
+* 80 character line length
+* indent, don't align
+
+## License
+
+By contributing to definition-finder, you agree that your contributions will be licensed
+under the LICENSE file in the root directory of this source tree.

README.md

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+# FBExpect
+
+FBExpect is a unit testing utility built on top of PHPUnit. The primary goal of
+this project is to allow Facebook to release our existing unit tests for other
+projects, however it does have advantages for third-party Hack projects:
+
+ - clarity
+ - type refinment for some assertions
+ - support for `vec`, `keyset`, and `dict` types
+
+## Examples
+
+### Clarity
+
+It is linguistically clearer which value is the expected value and which is the
+actual value:
+
+```Hack
+use Facebook\FBExpect\expect;
+
+// PHPUnit
+$this->assertSame($a, $b);
+
+// FBExpect
+expect($b)->toBeSame($a);
+```
+
+### Type Refinement
+
+```Hack
+use Facebook\FBExpect\expect;
+
+// PHPUnit
+$this->assertNotNull($x); // Actual test
+assert($x !== null); // Tell the typechecker what's going on
+$this->assertInstanceOf(Foo::class, $y);
+assert($y instanceof Foo);
+
+// FBExpect
+$x = expect($x)->toNotBeNull();
+$y = expect($y)->toBeInstanceOf(Foo::class);
+```
+
+## Installation
+
+FBExpect is installed via composer:
+
+```
+hhvm ~/composer require facebook/fbexpect
+```
+
+FBExpect supports HHVM's PHP7 mode, however as it is also supports
+having PHP7 mode disabled, it currently requires PHPUnit 5.
+
+## License
+
+FBExpect is BSD-licensed. We also provide an additional patent grant.