add a readme

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+# pecl/courierauth
+
+## About:
+
+Provides means for authentication against any courier authdaemond backends.
+
+## Installation:
+
+This extension is hosted at [PECL](http://pecl.php.net) and can be installed with [PEAR](http://pear.php.net)'s pecl command:
+
+    # pecl install courierauth
+
+Also, watch out for self-installing [pharext](https://github.com/m6w6/pharext) packages attached to [releases](https://github.com/m6w6/ext-courierauth/releases).