Added java-mongodb module (#978)

* Made maven project.

* Added mongo driver dependencies.

* Added crud operations.

* Class rename

* Added tests

java-mongodb/src/main/java/com/baeldung/MongoExample.java

@@ -0,0 +1,53 @@
+package com.baeldung;
+
+import com.mongodb.BasicDBObject;
+import com.mongodb.DB;
+import com.mongodb.DBCollection;
+import com.mongodb.DBCursor;
+import com.mongodb.MongoClient;
+
+public class MongoExample {
+    public static void main( String[] args ) {
+        
+    	MongoClient mongoClient = new MongoClient("localhost", 27017);
+    	
+    	DB database = mongoClient.getDB("myMongoDb");
+    	
+    	// print existing databases
+    	mongoClient.getDatabaseNames().forEach(System.out::println);
+    	
+    	database.createCollection("customers", null);
+    	
+    	// print all collections in customers database
+    	database.getCollectionNames().forEach(System.out::println);
+    	
+    	// create data
+    	DBCollection collection = database.getCollection("customers");
+    	BasicDBObject document = new BasicDBObject();
+    	document.put("name", "Shubham");
+    	document.put("company", "Baeldung");
+    	collection.insert(document);
+    	
+    	// update data
+    	BasicDBObject query = new BasicDBObject();
+    	query.put("name", "Shubham");
+    	BasicDBObject newDocument = new BasicDBObject();
+    	newDocument.put("name", "John");
+    	BasicDBObject updateObject = new BasicDBObject();
+    	updateObject.put("$set", newDocument);
+    	collection.update(query, updateObject);
+    	
+    	// read data
+    	BasicDBObject searchQuery = new BasicDBObject();
+    	searchQuery.put("name", "John");
+    	DBCursor cursor = collection.find(searchQuery);
+    	while (cursor.hasNext()) {
+    	  System.out.println(cursor.next());
+    	}
+    	
+    	// delete data
+    	BasicDBObject deleteQuery = new BasicDBObject();
+    	deleteQuery.put("name", "John");
+    	collection.remove(deleteQuery);
+    }
+}