Add simple healthcheck for markdown parser

Author: MeanderingProgrammer

lua/markdown/health.lua

@@ -0,0 +1,18 @@
+---@param name string
+local function parser_installed(name)
+    local ok = pcall(vim.treesitter.query.parse, name, '')
+    if ok then
+        vim.health.ok(name .. ' parser installed')
+    else
+        vim.health.error(name .. ' parser not found')
+    end
+end
+
+local M = {}
+
+function M.check()
+    vim.health.start('Checking required treesitter parsers')
+    parser_installed('markdown')
+end
+
+return M