[NO-ISSUE][GRAPHIX] Adding a README file.

Change-Id: I2bbeef42aaedc1c51621953afa0fabf21724b6eb
Reviewed-on: https://asterix-gerrit.ics.uci.edu/c/asterixdb-graph/+/16604
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Glenn Galvizo <ggalvizo@uci.edu>
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+<!--
+ ! Licensed to the Apache Software Foundation (ASF) under one
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+ ! regarding copyright ownership.  The ASF licenses this file
+ ! to you under the Apache License, Version 2.0 (the
+ ! "License"); you may not use this file except in compliance
+ ! with the License.  You may obtain a copy of the License at
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+ !   http://www.apache.org/licenses/LICENSE-2.0
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+# Property Graphs on AsterixDB: Graphix
+Graphix is an extension for the Big Data Management System Apache AsterixDB that allows users to issue graph queries on conceptual graphs over existing data managed by AsterixDB itself. Our motto is “one analyst’s document store is another analyst’s graph”, originating from the thought that developers shouldn’t have to choose between two different technologies (i.e. a document database or a graph database).
+
+See our website [here](https://graphix.ics.uci.edu) for more details.
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