added a yet short readme

README.md

@@ -0,0 +1,8 @@
+# PHP SDK
+
+PHP SDK is a toolset for building PHP under windows
+
+## Usage
+
+- git checkout https://github.com/OSTC/php-sdk-binary-tools.git c:\php-sdk
+- follow the instructions on the PHP [wiki page](https://wiki.php.net/internals/windows/stepbystepbuild "PHP wiki page")