Added ghdl simulation toolchain

Signed-off-by: Joppe Blondel <joppe@blondel.nl>

examples/formal/project.cfg

@@ -0,0 +1,28 @@
+[project]
+name                = formal_project
+version             = 0.1
+out_dir             = OUT
+build_dir           = BUILD
+
+[server]
+hostname            = localhost
+port                = 2020
+privkey             = /home/joppe/.ssh/id_rsa
+pubkey              = /home/joppe/.ssh/id_rsa.pub
+
+# ######################################
+# Basic VHDL simulation with GHDL
+[target.sim]
+toolchain           = ghdl
+
+# Toolchain settings
+toplevel            = tb_counter
+runtime             = all
+#ghdla_opts         = 
+#ghdle_opts         = 
+#ghdlr_opts         = 
+
+# Fileset
+files_vhdl          = RTL/counter.vhd 
+                      SIM/tb_counter.vhd
+# ######################################