feat: Init nvim from jalil-salame/nvim-config

Step one of Issue #15

nvim/options.nix

@@ -0,0 +1,22 @@
+{
+  # Appearance
+  number = true;
+  relativenumber = true;
+  colorcolumn = "+1";
+  cursorline = true;
+  wrap = false;
+  splitright = true;
+  # Tabs & indentation
+  smarttab = true;
+  autoindent = true;
+  smartindent = true;
+  # Search path
+  path = ".,/usr/include,**";
+  wildmenu = true;
+  hlsearch = true;
+  incsearch = true;
+  ignorecase = true; # Search ignores cases
+  smartcase = true; # Unless it has a capital letter
+  # Enable local configuration :h 'exrc'
+  exrc = true; # safe since nvim 0.9
+}