Add LICENSE and README

LICENSE.txt

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+BSD 2-Clause License
+
+Copyright (c) 2009-present, Homebrew contributors
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

README.md

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+# kabel/php-ext
+Core PHP extension formulae for the Homebrew package manager. These extensions are not a part of [Homebrew/core](https://github.com/Homebrew/homebrew-core/) because they are either not popular enough or have known stability problems.
+
+Other extensions that used to be available from, the now deprecated, [Homebrew/php](https://github.com/Homebrew/homebrew-php/) should be installed through [PECL](https://pecl.php.net/).
+
+## How do I install these formulae?
+`brew tap kabel/php-ext` then `brew install <formula>`
+
+## Troubleshooting
+First, please run `brew update` and `brew doctor`.
+
+Second, read the [Troubleshooting Checklist](https://docs.brew.sh/Troubleshooting).
+
+**If you don't read these it will take us far longer to help you with your problem.**
+
+## License
+Code is under the [BSD 2-clause "Simplified" License](https://github.com/Homebrew/homebrew-core/blob/master/LICENSE.txt).