tsk-5: Add contact (#7)

Closes #5

Reviewed-on: phoenix/textsender-api#7
Co-authored-by: phoenix <kundeng00@pm.me>
Co-committed-by: phoenix <kundeng00@pm.me>

migrations/schema.sql

@@ -0,0 +1,10 @@
+CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
+
+DROP TABLE IF EXISTS contacts CASCADE;
+
+CREATE TABLE contacts (
+    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
+    phone_number TEXT NOT NULL,
+    user_id UUID NOT NULL
+);
+