vhdl: added basic guide and vim integration

wiki/linux/vim/vhdl.md

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+# VHDL in Vim
+
+VHDL is a hardware description language.
+In this entry we will focus on making vim support VHDL.
+
+## Linting
+
+### Coc
+
+To enable linting and other language server features for [coc](coc.md) you need
+to install [hdl-checker](https://github.com/suoto/hdl_checker).
+After that you need to add the following lines to your coc config file.
+
+```json
+{
+    "hdlChecker": {
+        "command": "hdl_checker",
+        "args": [
+            "--lsp"
+        ],
+        "filetypes": [
+            "vhdl",
+            "verilog",
+            "systemverilog"
+        ]
+    }
+}
+```

wiki/programming-languages/vhdl.md

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+# VHDL
+
+VHDL is a hardware description language.
+
+## Installation
+
+To simulate a VHDL project get [GHDL](https://github.com/ghdl/ghdl).
+After simulating you can view the simulation with [GTKWave](https://github.com/gtkwave/gtkwave).
+
+## Makefile for basic project
+
+Easiest way to analyse and simulate your project is a `Makefile`:
+
+```make
+FILES = *.vhd
+
+ENITITY = <name for entity file>
+
+GHDL_CMD      = ghdl
+#GHDL_FLAGS    = --std=93c
+GHDL_FLAGS    = --ieee=synopsys -fexplicit
+GHDL_STOPTIME = <set according to simulation>ms
+GHDL_WAVEFILE = wave.ghw
+GTKWAVE_CMD   = gtkwave
+
+all: syntax analysis elaborate run wave clean
+
+syntax:
+        @echo Syntax-check
+        $(GHDL_CMD) -s $(GHDL_FLAGS) $(FILES)
+
+analysis:
+        @echo Analysis
+        $(GHDL_CMD) -a $(GHDL_FLAGS) $(FILES)
+
+elaborate:
+        @echo Elaboration
+        $(GHDL_CMD) -e $(GHDL_FLAGS) $(ENITITY)
+
+run:
+        @echo Run the simulation
+        $(GHDL_CMD) -r $(GHDL_FLAGS) $(ENITITY) --stop-time=$(GHDL_STOPTIME) --wave=$(GHDL_WAVEFILE)
+
+wave:
+        @echo Show the simulation
+        $(GTKWAVE_CMD) $(GHDL_WAVEFILE)
+
+clean:
+        @echo Remove generated files
+        $(GHDL_CMD) --remove
+```
+
+You can then for example do all steps by running `make all` in the according folder.
+
+## IDE
+
+### Vim
+
+The steps to make Vim VHDL-ready are described in [the vim section of this wiki](../linux/vim/vhdl.md).