feat: initialize prisma with Stock model

prisma/schema.prisma

@@ -0,0 +1,16 @@
+generator client {
+  provider = "prisma-client-js"
+  output   = "../node_modules/.prisma/client"
+}
+
+datasource db {
+  provider = "sqlite"
+}
+
+model Stock {
+  id        String   @id @default(cuid())
+  ticker    String   @unique
+  notes     String?
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+}