Regenerate max depth for deepmerge submodule. Add deepmerge-generate submodule. Remove README from submodules not supposed to be used separately from the main module (#9)

Author: aknysh

modules/assert/README.md

@@ -0,0 +1,6 @@
+// Use this to generate a new `depth.tf` file in the `deepmerge` module with a different max depth
+
+resource "local_file" "depth" {
+  content  = templatefile("${path.module}/../deepmerge/depth.tmpl", { max_depth = 25 })
+  filename = "${path.module}/../deepmerge/depth.tf"
+}