feat(api-db): initialize prisma with postgresql datasource

apps/api/prisma/schema.prisma

@@ -0,0 +1,13 @@
+// This is your Prisma schema file,
+// learn more about it in the docs: https://pris.ly/d/prisma-schema
+
+// Get a free hosted Postgres database in seconds: `npx create-db`
+
+generator client {
+  provider = "prisma-client"
+  output   = "../generated/prisma"
+}
+
+datasource db {
+  provider = "postgresql"
+}