feat: add C# LSP (omnisharp) and treesitter support

- Add omnisharp to LSP servers (auto-installed via Mason)
- Add c_sharp to treesitter filetypes for syntax highlighting

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

init.lua

@@ -91,7 +91,7 @@ vim.g.mapleader = ' '
 vim.g.maplocalleader = ' '
 
 -- Set to true if you have a Nerd Font installed and selected in the terminal
-vim.g.have_nerd_font = false
+vim.g.have_nerd_font = true
 
 -- [[ Setting options ]]
 -- See `:help vim.o`
@@ -102,7 +102,7 @@ vim.g.have_nerd_font = false
 vim.o.number = true
 -- You can also add relative line numbers, to help with jumping.
 --  Experiment for yourself to see if you like it!
--- vim.o.relativenumber = true
+vim.o.relativenumber = true
 
 -- Enable mouse mode, can be useful for resizing splits for example!
 vim.o.mouse = 'a'
@@ -198,10 +198,10 @@ vim.keymap.set('n', '<leader>q', vim.diagnostic.setloclist, { desc = 'Open diagn
 vim.keymap.set('t', '<Esc><Esc>', '<C-\\><C-n>', { desc = 'Exit terminal mode' })
 
 -- TIP: Disable arrow keys in normal mode
--- vim.keymap.set('n', '<left>', '<cmd>echo "Use h to move!!"<CR>')
--- vim.keymap.set('n', '<right>', '<cmd>echo "Use l to move!!"<CR>')
--- vim.keymap.set('n', '<up>', '<cmd>echo "Use k to move!!"<CR>')
--- vim.keymap.set('n', '<down>', '<cmd>echo "Use j to move!!"<CR>')
+vim.keymap.set('n', '<left>', '<cmd>echo "Use h to move!!"<CR>')
+vim.keymap.set('n', '<right>', '<cmd>echo "Use l to move!!"<CR>')
+vim.keymap.set('n', '<up>', '<cmd>echo "Use k to move!!"<CR>')
+vim.keymap.set('n', '<down>', '<cmd>echo "Use j to move!!"<CR>')
 
 -- Keybinds to make split navigation easier.
 --  Use CTRL+<hjkl> to switch between windows
@@ -593,7 +593,8 @@ require('lazy').setup({
       --  Feel free to add/remove any LSPs that you want here. They will automatically be installed.
       --  See `:help lsp-config` for information about keys and how to configure
       local servers = {
-        -- clangd = {},
+        clangd = {},
+        omnisharp = {},
         -- gopls = {},
         -- pyright = {},
         -- rust_analyzer = {},
@@ -614,7 +615,7 @@ require('lazy').setup({
       -- You can press `g?` for help in this menu.
       local ensure_installed = vim.tbl_keys(servers or {})
       vim.list_extend(ensure_installed, {
-        'lua_ls', -- Lua Language server
+        'lua-language-server', -- Lua Language server
         'stylua', -- Used to format Lua code
         -- You can add other tools here that you want Mason to install
       })
@@ -852,7 +853,7 @@ require('lazy').setup({
   { -- Highlight, edit, and navigate code
     'nvim-treesitter/nvim-treesitter',
     config = function()
-      local filetypes = { 'bash', 'c', 'diff', 'html', 'lua', 'luadoc', 'markdown', 'markdown_inline', 'query', 'vim', 'vimdoc' }
+      local filetypes = { 'bash', 'c', 'c_sharp', 'diff', 'html', 'lua', 'luadoc', 'markdown', 'markdown_inline', 'query', 'vim', 'vimdoc' }
       require('nvim-treesitter').install(filetypes)
       vim.api.nvim_create_autocmd('FileType', {
         pattern = filetypes,