Added LSP Trouble, WhichKey & LSP Colors (#77)

* added LSP Trouble

As the title says :)

* added lsp-colors

* added which-key.nvim

README.md

@@ -47,6 +47,8 @@ Neovim supports a wide variety of UI's.
 - [nvim-lua/lsp_extensions.nvim](https://github.com/nvim-lua/lsp_extensions.nvim) - Repo to hold a bunch of info & extension callbacks for built-in LSP.
 - [RishabhRD/nvim-lsputils](https://github.com/RishabhRD/nvim-lsputils) - Better defaults for nvim-lsp actions.
 - [glepnir/lspsaga.nvim](https://github.com/glepnir/lspsaga.nvim) - A light-weight lsp plugin based on neovim built-in lsp with a highly performant UI.
+- [folke/lsp-trouble.nvim](https://github.com/folke/lsp-trouble.nvim) - A pretty diagnostics list to help you solve all the trouble your code is causing.
+- [folke/lsp-colors.nvim](https://github.com/folke/lsp-colors.nvim) - A plugin that adds missing LSP diagnostics highlight groups for color schemes that don't yet support the builtin LSP client
 - [kosayoda/nvim-lightbulb](https://github.com/kosayoda/nvim-lightbulb) - The plugin shows a lightbulb in the sign column whenever a `textDocument/codeAction` is available at the current cursor position.
 - [onsails/lspkind-nvim](https://github.com/onsails/lspkind-nvim) - The plugin adds vscode-like icons to neovim lsp completions.
 - [ojroques/nvim-lspfuzzy](https://github.com/ojroques/nvim-lspfuzzy) - A small plugin to make the LSP client use FZF
@@ -327,6 +329,7 @@ Treesitter is a new system coming in Neovim 0.5 that incrementally parses your c
 
 ### Keybindings
 - [AckslD/nvim-whichkey-setup.lua](https://github.com/AckslD/nvim-whichkey-setup.lua) - Nvim-plugin what wraps vim-which-key to simplify setup in lua
+- [folke/which-key.nvim](https://github.com/folke/which-key.nvim) - Neovim plugin that shows a popup with possible keybindings of the command you started typing.
 
 ### Tmux