feat: testclient can accept JSON events from stdin

Usage:
- Standalone: ./bin/testclient (generates event)
- With nak: nak event "hello" | ./bin/testclient

Compatible with nak CLI for easy event generation

1 files changed, 16 insertions, 2 deletions

diff --git a/README.md b/README.md
index f3d961a..142b0f1 100644
--- a/README.md
+++ b/README.md
@@ -31,8 +31,8 @@ The relay will start listening on `:50051` (gRPC).
 
 ### Test with Client
 
+**Standalone mode:**
 ```bash
-# In another terminal:
 ./bin/testclient
 
 # Output:
@@ -40,10 +40,24 @@ The relay will start listening on `:50051` (gRPC).
 # Publishing event...
 # ✓ Event published successfully: abc123...
 # Querying events...
-# Found 1 events
+# Found 1 events from author abc123...
 #   - abc123...: Hello from gRPC client!
 ```
 
+**With nak CLI:**
+```bash
+# Pipe events from nak
+nak event "Hello from nak!" | ./bin/testclient
+
+# Or generate a signed event
+nak event --sec <nsec> --kind 1 "My message" | ./bin/testclient
+
+# Output:
+# Read event from stdin: abc123...
+# Publishing event...
+# ✓ Event published successfully: abc123...
+```
+
 ## gRPC API
 
 See [proto/nostr/v1/nostr.proto](proto/nostr/v1/nostr.proto) for the full API.