feat(pack): add c-sharp base pack (#312)

lua/astrocommunity/pack/cs/README.md

@@ -0,0 +1,11 @@
+# C# Language Pack
+
+**Requirements:** `dotnet` must be in your `PATH` and executable
+
+This plugin pack does the following:
+
+- Adds `c_sharp` Treesitter parsers
+- Adds `csharp_ls` language server
+- Adds the following `null-ls` sources:
+  - [csharpier](https://github.com/belav/csharpier)
+- Adds `coreclr` debug adapters for nvim-dap

lua/astrocommunity/pack/cs/init.lua

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+local utils = require "astronvim.utils"
+return {
+  -- CSharp support
+  {
+    "nvim-treesitter/nvim-treesitter",
+    opts = function(_, opts)
+      if opts.ensure_installed ~= "all" then
+        opts.ensure_installed = utils.list_insert_unique(opts.ensure_installed, "c_sharp")
+      end
+    end,
+  },
+  {
+    "jay-babu/mason-null-ls.nvim",
+    opts = function(_, opts) opts.ensure_installed = utils.list_insert_unique(opts.ensure_installed, "csharpier") end,
+  },
+  {
+    "williamboman/mason-lspconfig.nvim",
+    opts = function(_, opts) opts.ensure_installed = utils.list_insert_unique(opts.ensure_installed, "csharp_ls") end,
+  },
+  {
+    "mfussenegger/nvim-dap",
+    {
+      "jay-babu/mason-nvim-dap.nvim",
+      opts = function(_, opts) opts.ensure_installed = utils.list_insert_unique(opts.ensure_installed, "coreclr") end,
+    },
+  },
+}