open source: add requirements.txt

Also add instructions to README.md, explaining how to get prerequisites.

Change-Id: I183242faae5ffc099100b6481f24edabb0a4d73c

README.md

diff --git a/README.md b/README.md
index 521cba4..0d9a41d 100644
--- a/README.md
+++ b/README.md
@@ -30,6 +30,12 @@
 
 ### Prerequisite:
 
+To run TBM you will need Python3 and the packages listed in `requirements.txt`.
+You can install the packages with pip: `pip install -r requirements.txt`.
+
+You will also need the flatbuffers compiler `flatc`. On Debian based distros you
+can get it with apt: `sudo apt install flatbuffers-compiler`
+
 The make scripts expect the following environment variables and directory
 structure:
 
@@ -118,16 +124,16 @@
 `make merge-pyi` to merge into all `.py` files, or `make merge-pyi-MOD` to
 merge into `tbm/MOD.py`.
 
+<!--- BEGIN-INTERNAL -->
 ### Running tests from shodan
 
-<!--- BEGIN-INTERNAL -->
 - `make -f integration-tests.mk integration_tests` - most of these tests are
 actually not very good for integration testing as they take far too long to
 complete.
-<!--- END-INTERNAL -->
 - `make -f riscv_tests.mk riscv_tests_isa` - run some of the tests from `$ROOTDIR/out/springbok/riscv-tests/isa`.
 - `make -f riscv_tests.mk riscv_tests_benchmarks` - run the tests from `$ROOTDIR/out/springbok/riscv-tests/benchmarks`.
 - `make -f riscv_tests.mk riscv_tests` - run the two previous targets.
 - `make -f riscv_tests.mk benchmarks` - runs the above benchmarks and generates
   the file `benchmarks.md` with all the results.
 - `make -f rvv_tests.mk rvv_tests` - run the tests from `$ROOTDIR/out/springbok/rvv_for_tbm/tests/`.
+<!--- END-INTERNAL -->

requirements.txt

diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..1afdd25
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,4 @@
+flatbuffers
+gzip
+jsonschema
+pyyaml