nim: added installation and vim support

wiki/linux/vim/nim.md

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+# Nim
+
+[Nim](https://nim-lang.org) is a statically typed compiled systems programming
+
+## Autocompletion
+
+### Coc
+
+To enable autocompletion for coc you need to install `nimlsp`
+(`nimble install nimlsp`).
+After that you need to add the following lines to your coc config file.
+
+```json
+{
+    "languageserver": {
+        "nim": {
+            "command": "nimlsp",
+            "filetypes": ["nim"],
+            "trace.server": "verbose"
+        }
+   }
+}
+```
+
+### Highlighting
+
+To enable highlighting you can install a
+[nvim plugin by alaviss](https://github.com/alaviss/nim.nvim).

wiki/programming-languages/nim.md

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+# Nim
+
+[Nim](https://nim-lang.org) is a statically typed compiled systems programming
+language.
+
+## Installation
+
+You can install nim using choosenim with
+`curl https://nim-lang.org/choosenim/init.sh -sSf | sh`.
+
+## IDE
+
+### Vim
+
+The steps to make Vim a c IDE are described in
+[the vim section of this wiki](../linux/vim/nim.md).