Feat: Upload Files (#59)

This MR adds the ability to add files to comments, notes, replys, and MR descriptions via a picker.

The file will get uploaded to Gitlab and the filepath will be automatically added into the current popup buffer at the current line. You can then save the changes with the normal save functionality.

README.md

@@ -15,7 +15,7 @@ https://github.com/harrisoncramer/gitlab.nvim/assets/32515581/ab5a8597-32fa-4a28
 
 ## Requirements
 
-- <a href="https://go.dev/">Go >= v1.19</a>
+- <a href="https://go.dev/">Go</a> >= v1.19
 
 ## Quick Start
 
@@ -87,6 +87,7 @@ require("gitlab").setup({
   port = 21036, -- The port of the Go server, which runs in the background
   log_path = vim.fn.stdpath("cache") .. "/gitlab.nvim.log", -- Log path for the Go server
   reviewer = "delta", -- The reviewer type ("delta" or "diffview")
+  attachment_dir = nil, -- The local directory for files (see the "summary" section)
   popup = { -- The popup for comment creation, editing, and replying
     exit = "<Esc>",
     perform_action = "<leader>s", -- Once in normal mode, does action (like saving comment or editing description, etc)
@@ -144,12 +145,16 @@ git checkout feature-branch
 
 Then open Neovim. The `project_id` you specify in your configuration file must match the project_id of the Gitlab project your terminal is inside of. 
 
+### Summary
+
 The `summary` action will pull down the MR description into a buffer so that you can read it. To edit the description, use the `settings.popup.perform_action` keybinding.
 
 ```lua
 require("gitlab").summary()
 ```
 
+### Reviewing Diffs
+
 The `review` action will open a diff of the changes. You can leave comments using the `create_comment` action.
 
 ```lua
@@ -157,6 +162,8 @@ require("gitlab").review()
 require("gitlab").create_comment()
 ```
 
+The reviewer is Delta by default, but you can configure the plugin to use Diffview instead.
+
 ### Discussions and Notes
 
 Gitlab groups threads of comments together into "discussions." 
@@ -177,6 +184,14 @@ If you'd like to create a note in an MR (like a comment, but not linked to a spe
 require("gitlab").create_note()
 ```
 
+### Uploading Files
+
+To attach a file to an MR description, reply, comment, and so forth use the `settings.popup.perform_linewise_action` keybinding when the the popup is open. This will open a picker that will look in the directory you specify in the `settings.attachment_dir` folder (this must be an absolute path) for files. 
+
+When you have picked the file, it will be added to the current buffer at the current line.
+
+Use the `settings.popup.perform_action` to send the changes to Gitlab.
+
 ### MR Approvals
 
 You can approve or revoke approval for an MR with the `approve` and `revoke` actions respectively.