Added README and composer file for PIE

README.rst

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+TimezoneDB
+==========
+
+This extension is a drop-in replacement for the builtin timezone database that
+comes with PHP. You should only install this extension in case you need to get
+a later version of the timezone database than the one that ships with PHP.
+
+The data that this extension uses comes from the "Olson" database, which is
+located at http://www.iana.org/time-zones.

composer.json

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+{
+    "name": "pecl/timezonedb",
+    "type": "php-ext",
+    "license": "PHP-3.01",
+    "description": "This extension is a drop-in replacement for the builtin timezone database that comes with PHP.",
+    "require": {
+        "php": ">=5.4"
+    },
+    "php-ext": {
+        "priority": 20,
+        "configure-options": []
+    }
+}