docs: add tidb on hbase instruction

docs/HBASE_QUICKSTART.md

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+# TiDB on HBase
+
+
+**TiDB only supports HBase >= 0.98.5**
+
+1) Build && Install pingcap/themis coprocessor to HBase:
+
+1. git clone https://github.com/pingcap/themis.git
+2. cd themis && mvn clean package -DskipTests
+4. cp themis-coprocessor/target/themis-coprocessor-1.0-SNAPSHOT-jar-with-dependencies.jar $HBASE_ROOT/lib
+5. Add configurations for themis coprocessor in hbase-site.xml:
+
+```
+<property>
+    <name>hbase.coprocessor.user.region.classes</name>
+    <value>org.apache.hadoop.hbase.themis.cp.ThemisEndpoint,org.apache.hadoop.hbase.themis.cp.ThemisScanObserver,org.apache.hadoop.hbase.regionserver.ThemisRegionObserver</value>
+</property>
+<property>
+    <name>hbase.coprocessor.master.classes</name>
+    <value>org.apache.hadoop.hbase.master.ThemisMasterObserver</value>
+</property>
+```
+
+and then restart HBase.
+
+
+2) Build TiDB:
+
+```
+git clone https://github.com/pingcap/tidb.git $GOPATH/src/github.com/pingcap/tidb
+cd $GOPATH/src/github.com/pingcap/tidb
+make
+```
+
+Run command line interpreter:
+
+```
+make interpreter
+cd interpreter && ./interpreter -store hbase -dbpath localhost/tidb -dbname test
+```
+
+Enjoy it.
+
+```
+Welcome to the TiDB.
+Version:
+Git Commit Hash: f37bd11d16c79a3db1cdb068ef7a6c872f682cda
+UTC Build Time:  2015-12-07 08:10:25
+
+tidb> create table t1(id int, name text, key id(id));
+Query OK, 0 row affected (2.12 sec)
+tidb> insert into t1 values(1, "hello");
+Query OK, 1 row affected (0.01 sec)
+tidb> insert into t1 values(2, "world");
+Query OK, 1 row affected (0.00 sec)
+tidb> select * from t1;
++----+-------+
+| id | name  |
++----+-------+
+| 1  | hello |
+| 2  | world |
++----+-------+
+2 rows in set (0.00 sec)
+tidb>