New migration and query examples with Client Java

[grabl]

This issue was originally posted by @sorsaffari on 2018-08-22 18:02.

The goal: of this requirement is to:

1. create migration examples that use our drivers, rather than the Graql Migration templates (how it's currently documented)
2. write a tutorial for each example
3. publish the tutorial on the blog and documentation platform
   Examples: For each Grakn Client driver illustrate migrating data from the following formats:
4. CSV
5. SQL
6. JSON
7. XML

Dataset: For each example must have one or more of the following characteristics:

1. contains simple data types
2. contains a simple relationship

Article structure: Given a simple dataset in a given format (e.g. CSV), show how to:

1. Define the schema of the database

• make a simple schema
• load the schema into the database
• query the schema (through terminal)
• write an example of insert query (through terminal)

2. Load the dataset to the database

• import the driver into the program
• read the dataset into the program
• create a database session and transaction in the program
• produce the insert queries with the dataset
• write and commit the insert queries, using the transactions, onto the database

3. Query the data

• query the data from the database
• visualise the data

This issue needs #27, needs #28, needs #29, needs #40, needs #41