add example sdl

Author: n1ru4l

packages/libraries/cli/examples/getting-started/products.graphql

@@ -0,0 +1,10 @@
+extend type Query {
+  topProducts(first: Int = 5): [Product]
+}
+
+type Product @key(fields: "upc") {
+  upc: String!
+  name: String
+  price: Int
+  weight: Int
+}

packages/libraries/cli/examples/getting-started/reviews.graphql

@@ -0,0 +1,17 @@
+type Review @key(fields: "id") {
+  id: ID!
+  body: String
+  author: User @provides(fields: "username")
+  product: Product
+}
+
+extend type User @key(fields: "id") {
+  id: ID! @external
+  username: String @external
+  reviews: [Review]
+}
+
+extend type Product @key(fields: "upc") {
+  upc: String! @external
+  reviews: [Review]
+}

packages/libraries/cli/examples/getting-started/users.graphql

@@ -0,0 +1,11 @@
+extend type Query {
+  me: User
+  user(id: ID!): User
+  users: [User]
+}
+
+type User @key(fields: "id") {
+  id: ID!
+  name: String
+  username: String
+}