Add shortcut ":Gc" to vim for simple fast commits

When working in vim I have developed some pattern which fell fast and
confident enough for me to being typed all the time.
E.g. I catch myself often doing typing the following: `:Gw<CR>:G<CR>cc`
These keystrokes safe the current file directly to the staging area of
git (:Gw), then opening the fugitive-panel (:G) and finally letting me
write a commit-message form there (cc).
The keypart here is that I _have_ to open the fugitive-panel to perform
a commit, since I don't use any abbreviation for "commit" on git itself
the only other way is typing `:Gw<CR>:G commit` which is cumbersome.

This change allows me to type just another short version (namely:
`:Gw<CR>:Gc`) which saves 2 keystrokes and a whole panel-rendering.
Though this change is experimental right now since I don't know if I
really get used to it.

.config/nvim/lua/plugins/fugitive.lua

@@ -13,6 +13,10 @@ return {
 			{ "<Leader>glq", cmd("0Gclog -- %"), desc = "Quicklist revisions of the current file" },
 			{ "<Leader>go", cmd("GBrowse"), desc = "Open file in Browser in Remote-Repo"}
 		},
+		config = function ()
+			-- alias to only type :Gc to commit
+			vim.api.nvim_create_user_command("Gc", "G commit", {})
+		end
 	},
 	-- Github integration for :GBrowse
 	{ "tpope/vim-rhubarb" },