chore(nvim): add hologram plugin

nvim/after/plugin/hologram.lua

@@ -0,0 +1,9 @@
+-- Hologram – https://github.com/edluffy/hologram.nvim
+local status, hologram = pcall(require, "hologram")
+if not status then
+	return
+end
+
+hologram.setup({
+	auto_display = true,
+})

nvim/lua/kogakure/plugins.lua

@@ -152,6 +152,7 @@ return packer.startup(function(use)
 	use("rhysd/vim-grammarous") -- A powerful grammar checker for Vim using LanguageTool
 	use("mechatroner/rainbow_csv") -- Rainbow CSV
 	use("dbeniamine/cheat.sh-vim") -- Cheat.sh
+	use("edluffy/hologram.nvim") -- Terminal image viewer
 
 	-- Custom Text Objects
 	use("christoomey/vim-titlecase")