add contact model

src/models/schema.prisma

@@ -0,0 +1,42 @@
+generator client {
+  provider = "prisma-client-js"
+}
+
+datasource db {
+  provider = "postgresql"
+  url      = env("POSTGRES_URL")
+}
+
+model Contact{
+    id Int @id @default(autoincrement())
+    phoneNumber String?
+    email String?
+    linkedId Int?
+    linkPrecedence LinkPrecedence
+    createdAt DateTime @default(now())
+    updatedAt DateTime @updatedAt
+    deletedAt DateTime?
+
+    @@index([phoneNumber])
+    @@index([email])
+}
+
+enum LinkPrecedence{
+    secondary
+    primary
+}
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