Add some docs

TENDERMINT_INTEGRATION.rst

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+**********************
+Tendermint Integration
+**********************
+Quick reference for developers working on the Tendermint integration in
+BigchainDB.
+
+Running a single node with ``docker-compose``
+=============================================
+
+.. code-block:: bash
+
+    $ docker-compose -f docker-compose.tendermint.yml up bdb
+
+The above command will launch all 3 main required services/processes:
+
+* ``mongodb``
+* ``tendermint``
+* ``bigchaindb``
+
+To follow the logs of the ``tendermint`` service:
+
+.. code-block:: bash
+
+    $ docker-compose -f docker-compose.tendermint.yml logs -f tendermint
+
+Simple health check:
+
+.. code-block:: bash
+
+    $ docker-compose -f docker-compose.tendermint.yml up curl-client
+
+Post and retrieve a transaction -- copy/paste a driver basic example of a
+``CREATE`` transaction:
+
+.. code-block:: bash
+
+    $ docker-compose -f docker-compose.tendermint.yml run --rm driver ipython
+
+.. todo:: small python script to post and retrieve a transaction.
+
+
+Running a 4-node cluster with ``docker-compose``
+================================================
+
+
+.. code-block:: bash
+
+    $ docker-compose -f docker-compose.network.yml up -d bdb-one bdb-two bdb-three bdb-four
+
+
+Simple health check:
+
+.. code-block:: bash
+
+    $ docker-compose -f docker-compose.network.yml up curl-client

network/health-check.sh

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+echo "########################################################################"
+echo "#                                                                      #"
+echo "#                             NODE ONE                                 #"
+echo "#                                                                      #"
+echo "########################################################################"
+curl http://tendermint-one:46657/abci_query && curl http://bdb-one:9984/
+
+echo "########################################################################"
+echo "#                                                                      #"
+echo "#                             NODE TWO                                 #"
+echo "#                                                                      #"
+echo "########################################################################"
+curl http://tendermint-two:46657/abci_query && curl http://bdb-two:9984/
+
+echo "########################################################################"
+echo "#                                                                      #"
+echo "#                             NODE THREE                               #"
+echo "#                                                                      #"
+echo "########################################################################"
+curl http://tendermint-three:46657/abci_query && curl http://bdb-three:9984/
+
+echo "########################################################################"
+echo "#                                                                      #"
+echo "#                             NODE FOUR                                #"
+echo "#                                                                      #"
+echo "########################################################################"
+curl http://tendermint-four:46657/abci_query && curl http://bdb-four:9984/