added initial roadmap and implementation

gateway/Cargo.toml

@@ -0,0 +1,27 @@
+[package]
+name = "gateway"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+common = { workspace = true }
+auth = { workspace = true }
+data_api = { workspace = true }
+control_plane = { workspace = true }
+realtime = { workspace = true }
+storage = { workspace = true }
+
+tokio = { workspace = true }
+axum = { workspace = true }
+tracing = { workspace = true }
+tracing-subscriber = { workspace = true }
+serde = { workspace = true }
+serde_json = { workspace = true }
+sqlx = { workspace = true }
+dotenvy = { workspace = true }
+anyhow = { workspace = true }
+axum-prometheus = "0.6"
+tower_governor = "0.4.2"
+tower-http = { version = "0.6.8", features = ["cors", "trace"] }
+moka = { version = "0.12.14", features = ["future"] }
+