Add setup instructions for robot-test-scripts with the secure core.

Created `RunningOpenTitanVectorSimulation.md` providing
step-by-step instructions for setting up Henry's example for renode
simulation of OpenTitan.

Change-Id: I7d9ac77d6677d688394c68120a169d12eddc9182

RunningOpenTitanVectorSimulation.md

diff --git a/RunningOpenTitanVectorSimulation.md b/RunningOpenTitanVectorSimulation.md
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+# OpenTitan RISCV Vector Simulation in Renode
+
+Follow setups in this document to build and run the following examples:
+
+1. [OpenTitan Hello World Basic Example](#opentitan-hello-world-basic-example)
+2. [OpenTitan Hello World Vector Sim Example, WIP](#opentitan-hello-world-vector-sim-example-wip)
+
+Keep an eye on the file below for new build targets as they become available:
+
+```
+$ROOTDIR/build/opentitan_sw.mk
+```
+
+```
+Note: Renode runs in multiple x-windows.
+Renode does not presently have a terminal only mode.
+Run within a graphical session or set up X-Forwarding to run these examples.
+```
+
+## OpenTitan Hello World Basic Example
+
+These instructions guide through setting up and running a test of OpenTitan with a bare-bones Renode
+robot-test-script.
+
+### Sync and set up environment
+
+```
+repo sync
+source ./build/setup.sh
+```
+
+### Build tools
+
+```
+m tools
+```
+
+### Build OpenTitan helloworld Demo
+
+```
+m opentitan_sw_bootrom
+```
+
+```
+m opentitan_sw_helloworld
+```
+
+### Start OpenTitan Renode Script
+
+```
+renode -e "i @sim/config/shodan_secure.resc; start"
+```
+
+### Run `shodan_bootrom.robot` Robot-Test-Script
+
+```
+cd "${ROOTDIR}/sim/tests"
+./test.sh shodan_bootrom.robot
+```
+
+Note: since we build Renode from source, we are to use Renode's provided `test.sh` instead of
+`renode-test` for running robot test scripts.
+
+[More details in Renode's documentation](https://renode.readthedocs.io/en/latest/introduction/testing.html#running-the-robot-test-script)
+
+
+### View Results of the Tests
+
+Results of the robot-test-script will be found in the following files:
+
+```
+$ROOTDIR/out/host/renode/tests/report.html
+$ROOTDIR/out/host/renode/tests/robot_output.xml
+$ROOTDIR/out/host/renode/tests/log.html
+```
+
+The `report.html` will share the results of each test.
+
+One can utilize `robot_output.xml` for scripts/programs which may want to parse
+and act on results.
+
+## OpenTitan Hello World Vector Sim Example, WIP