add readme

README.md

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+# gopher.nvim
+
+Minimalistic plugin for Go development in Neovim written in Lua.
+
+It's not an LSP tool, the main goal of this plugin add go tooling support in neovim
+
+## Install
+Pre-dependency: [go](https://github.com/golang/go) (tested on 1.17 and 1.18)
+
+```lua
+use {
+    "olexsmir/gopher.nvim",
+    requires = {
+        "nvim-treesitter/nvim-treesitter", -- dependencie
+    },
+}
+```
+
+Also, run `TSInstall go` if install the `go` parser if not installed yet.
+
+## Features
+1. Install requires go tools:
+```lua
+require"gopher".install_deps()
+```
+
+1. Modify struct tags by:
+`json` default tag for add & remove
+
+```lua
+require"gopher".tags_add("json") -- add json tag
+require"gopher".tags_rm("json")  -- remove json tag
+```