Update GettingStarted with toolchain and IREE information

Change-Id: I29f13cb1964f6b02afbe9bcf2dc8cdcbb255f05a

GettingStarted.md

diff --git a/GettingStarted.md b/GettingStarted.md
index f239a0e..972c556 100644
--- a/GettingStarted.md
+++ b/GettingStarted.md
@@ -61,7 +61,7 @@
 Install the RISCV toolchain:
 
 ```
-m toolchain
+m tools
 ```
 
 Install the instruction set simulator:
@@ -153,6 +153,11 @@
 
 Contains tools and src for simulation of the shodan hw.
 
+#### toolchain/
+
+Contains the src to build the RISCV GCC/LLVM/QEMU toolchain, and
+[IREE](https://github/com/google/iree) toolchain for ML models.
+
 ## Start a simulation
 
 The simulator used for Shodan is [Renode](https://renode.io/).
@@ -173,6 +178,45 @@
 start
 ```
 
+## Build and test ML artifacts
+
+The ML executable is built with [IREE](https://github.com/google/iree) workflow.
+The flow for RISCV 32-bit is still WIP, so you need to build the toolchain outside of the `m tools`
+in the previous section. Eventually it will become part of the default toolchain.
+
+The following instructions are the based on the
+[getting started doc](https://google.github.io/iree/get-started/getting-started-riscv-cmake)
+on IREE webpage but the GCC/LLVM toolchain are built from the source code.
+
+To build the IREE RISCV prerequisite toolchains:
+```
+m toolchain_llvm
+m qemu
+```
+
+To build the IREE targets:
+```
+m iree
+```
+
+To run the toy example (abs(-10)) for testing:
+```
+bash scripts/run-iree.sh
+```
+
+The output should be shown as:
+```
+I .../iree/tools/utils/vm_util.cc:258] Creating driver and device for 'dylib'...
+Error in cpuinfo: processor architecture is not supported in cpuinfo
+Error in cpuinfo: processor architecture is not supported in cpuinfo
+EXEC @abs
+I .../iree/tools/utils/vm_util.cc:201] result[0]: Buffer<sint32[]>
+EXEC @abs i32=10
+Smoke test passed
+
+```
+The test is also checked at the end of `m iree`
+
 ## More Information
 
   - [Information on how to use repo](https://go/repo)