Add configuration files, database migrations, and authentication implementation scaffolding

sqlc.yaml

@@ -0,0 +1,13 @@
+version: "2"
+sql:
+  - schema: "internal/db/migrations/000001_init.up.sql"
+    queries: "internal/db/queries.sql"
+    engine: "postgresql"
+    gen:
+      go:
+        package: "sqlc"
+        out: "internal/db/sqlc"
+        emit_json_tags: true
+        emit_prepared_queries: false
+        emit_interface: true
+        emit_exact_table_names: false