Add README with updated instructions how to run the testsuite

Author: andreasabel

Makefile-test

@@ -0,0 +1,58 @@
+PLT Lab 1 Test Suite
+====================
+
+Programming Language Technology (PLT, Chalmers DAT151, University of Gothenburg DIT231)
+
+This is the Test for PLT lab 1: Engineering a BNFC grammar for a fragment of C++.
+
+Prerequisites
+-------------
+
+To run this testsuite, recent versions of the following Haskell tools need to be installed.
+
+- [Haskell Stack](https://docs.haskellstack.org/en/stable/), e.g. version 3.1.1
+- [GHC](https://www.haskell.org/ghc/) version 9.4.8
+- [BNFC](https://bnfc.digitalgrammars.com/), e.g. version 2.9.5
+- [Alex](https://haskell-alex.readthedocs.io/en/stable/)
+- [Happy](https://haskell-happy.readthedocs.io/en/stable/)
+
+These tools need to be in the [`PATH`](https://en.wikipedia.org/wiki/PATH_(variable))
+in your [command shell](https://en.wikipedia.org/wiki/Shell_(computing)).
+
+Running the testsuite
+---------------------
+
+Invoke the test runner with the path to your `.cf` BNFC grammar file:
+```
+stack run -- path/to/your/file.cf
+```
+
+**NOTE:** The start category (entry point) of your grammar must be called `Program`.
+
+Installing the prerequisites
+----------------------------
+
+Here is a suggestion how to install the prerequisites, if needed.
+
+First install [GHCup](https://www.haskell.org/ghcup/).
+Then use it to install Stack and GHC.
+```
+ghcup install stack latest
+ghcup install ghc 9.4.8
+```
+If needed, add to your system `PATH` the location where GHCup installs tools.
+
+Finally, use Stack to install the remaining tools.
+```
+stack install alex happy BNFC
+```
+If needed, add to your system `PATH` the location where Stack installs tools.
+
+Verify that these tools are working by querying their version:
+```
+stack --version
+ghc   --version
+bnfc  --version
+alex  --version
+happy --version
+```