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"
+        ]
+    }
+}
+```