introduce roadmap

docs/roadmap.md

@@ -0,0 +1,15 @@
+# Roadmap
+
+## Learning and adoption
+
+- [_] feature: `mkunion watch ./...` command that watches for changes in files and runs faster than go generate
+- [_] docs: document simple state machine and how to use `mkunion` for it
+- [_] docs: document other packages in `x/` directory
+- [_] docs: document typescript types generation and end-to-end typs concepts (from backend to frontend)
+- [_] feature: expose functions to extract `go:tag` metadata
+- [_] docs: describe philosophy of "data as resource" and how it translates to some of library concepts
+
+## Long tern experiments and prototypes
+
+- [_] experiment: generate other serialization formats (e.g. grpc)
+- [_] prototype: http & gRPC client for end-to-end types. 

example/tree.go

@@ -1,6 +1,6 @@
 package example
 
-//go:generate go run ../cmd/mkunion/main.go
+//go:generate go run ../cmd/mkunion/main.go --type-registry
 
 //go:tag mkunion:"Tree"
 type (