Readme Added for AGE-JDBC-Driver (#383)

* added readme for age-jdbc-driver

drivers/jdbc/README.md

@@ -0,0 +1,98 @@
+# **AGE AGType parser and driver support for Java**
+
+AGType parser and driver support for [Apache AGE](https://age.apache.org/), graph extention for PostgreSQL.
+
+## Prerequisites
+
+You should have installed following jar files and packages.
+
+- [gradle](https://gradle.org/install/) build tool
+- [postgres JDBC driver](https://jdbc.postgresql.org/download/)
+- [antlr4-4.9.2-complete](https://repo1.maven.org/maven2/org/antlr/antlr4/4.9.2/)
+- [common-lang3](http://www.java2s.com/Code/Jar/c/Downloadcommonlang3jar.htm)
+- [commons-text-1.6](http://www.java2s.com/ref/jar/download-commonstext16jar-file.html)
+
+Kindly unzip the jars if they are zipped before using them.
+
+## Build from source
+
+```bash
+git clone https://github.com/apache/age.git
+cd age/drivers/jdbc
+
+gradle assemble
+```
+
+After the build completes successfully, a jar file will be created at path `age/drivers/jdbc/lib/build/libs/lib.jar`. Now add this JAR file to class path for your java project.
+
+## Getting Started
+
+* Install AGE on your machine. [https://age.apache.org/age-manual/master/index.html](https://age.apache.org/age-manual/master/index.html)
+* Add the downloaded jar files to class path.
+* Connect to the postgres server using pg JDBC drivers. 
+
+Lets say we have a graph named `demo_graph` having some nodes. In order to extract its nodes we can try following steps. To create some more graphs. [https://github.com/apache/age#quick-start](https://github.com/apache/age#quick-start). Following sample code shows how to return query result as `Agtype`.
+
+```java
+import org.apache.age.jdbc.base.Agtype;
+import org.postgresql.jdbc.PgConnection;
+
+import java.sql.*;
+
+public class Sample {
+    static final String DB_URL = "jdbc:postgresql://localhost:5432/demo";
+    static final String USER = "postgres";
+    static final String PASS = "pass";
+
+    public static void main(String[] args) {
+
+        // Open a connection
+        try {
+
+            PgConnection connection = DriverManager.getConnection(DB_URL, USER, PASS).unwrap(PgConnection.class);
+            connection.addDataType("agtype", Agtype.class);
+
+            // configure AGE
+            Statement stmt = connection.createStatement();
+            stmt.execute("CREATE EXTENSION IF NOT EXISTS age;");
+            stmt.execute("LOAD 'age'");
+            stmt.execute("SET search_path = ag_catalog, \"$user\", public;");
+
+            // Run cypher
+            ResultSet rs = stmt.executeQuery("SELECT * from cypher('demo_graph', $$ MATCH (n) RETURN n $$) as (n agtype);");
+
+            while (rs.next()) {
+
+                // Returning Result as Agtype
+                Agtype returnedAgtype = rs.getObject(1, Agtype.class);
+
+                String nodeLabel = returnedAgtype.getMap().getObject("label").toString();
+                String nodeProp =  returnedAgtype.getMap().getObject("properties").toString();
+
+                System.out.println("Vertex : " + nodeLabel + ", \tProps : " + nodeProp);
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+}
+```
+
+Output
+
+```
+Vertex : Person, 	Props : {bornIn=Pakistan, name=imran}
+Vertex : Person, 	Props : {bornIn=Pakistan, name=ali}
+Vertex : Person, 	Props : {bornIn=US, name=james}
+Vertex : Person, 	Props : {bornIn=Pakistan, name=ali}
+Vertex : Person, 	Props : {bornIn=Pakistan, name=usama}
+Vertex : Person, 	Props : {bornIn=Pakistan, name=akabr}
+Vertex : Country, 	Props : {name=Pakistan}
+Vertex : Country, 	Props : {name=US}
+```
+
+## For more information about [Apache AGE](https://age.apache.org/)
+
+- Apache Age : [https://age.apache.org/](https://age.apache.org/)
+- Github : [https://github.com/apache/age](https://github.com/apache/age)
+- Document : [https://age.apache.org/age-manual/master/index.html](https://age.apache.org/age-manual/master/index.html)