Introduce autocommand for formatting

Now, before a file is saved, we call the vim api format() function
which formats the content of the file.

lua/myworkflow/autocommands.lua

@@ -0,0 +1,5 @@
+vim.api.nvim_create_autocmd('BufWritePre', {
+    callback = function()
+        vim.lsp.buf.format { async = false }
+    end
+})

lua/myworkflow/init.lua

@@ -1,3 +1,4 @@
 require("myworkflow.remap")
 require("myworkflow.set")
 require("myworkflow.packer")
+require("myworkflow.autocommands")