add custom signer proxy

crates/browser-signer-proxy/Cargo.toml

@@ -0,0 +1,19 @@
+[package]
+name = "browser-signer-proxy"
+version = "0.1.0"
+edition.workspace = true
+description = "Nostr browser signer (NIP-07) proxy using smol async runtime"
+license = "MIT"
+repository = "https://github.com/nostrdevkit/nostr"
+publish = false
+
+[dependencies]
+atomic-destructor = "0.2"
+event-listener = "5"
+nostr.workspace = true
+opaquerr = "0.1"
+serde.workspace = true
+serde_json.workspace = true
+smol.workspace = true
+tracing = { version = "0.1", features = ["std"] }
+uuid = { version = "1.23", features = ["serde", "v4"] }