doc: deprecate

README.md

@@ -1,5 +1,7 @@
 # celestia-da
 
+> :warning: **celestia-da is deprecated. See the [migration guide](./migration.md) for details.**
+
 celestia-da is an implementation of the [Generic DA interface](https://github.com/rollkit/go-da)
 for modular blockchains. It extends celestia-node and runs a gRPC service,
 which can be used by rollup clients to read and write blob data to a specific

migration.md

@@ -0,0 +1,26 @@
+### Migration
+
+celestia-da after v0.13.2 release is deprecated and will no longer be
+maintained.
+
+Since go-da v0.5.0 now supports JSONRPC and celestia-node as of v0.13.0
+implements the DA interface over JSONRPC, clients should migrate to using the
+JSONRPC client instead.
+
+A JSONRPC client requires the dial address and an auth token with a blob write
+permission. It can be instantiated as follows:
+
+```go
+import (
+    "github.com/rollkit/go-da/proxy/jsonrpc"
+)
+
+// url = "http://localhost:26658"
+// auth_token = $(celestia light auth write)
+
+client, err := jsonrpc.NewClient(ctx, url, auth_token)
+client.DA.MaxBlobSize()
+// returns 1974272
+```
+
+See the [go-da releasenotes](https://github.com/rollkit/go-da/releases/tag/v0.5.0) for details.