docs: add Pylon service (graphql#1735)

* docs: add Pylon service

* rename src/code/services/pylon.md to src/code/language-support/javascript /server/pylon.md

* docs: fix pylon.md format

Author: schettn

src/code/language-support/javascript /server/pylon.md

@@ -0,0 +1,68 @@
+---
+name: Pylon
+description: A code-first approach to GraphQL API development that generates schemas from TypeScript in real-time, enhancing development speed, type safety, and error reduction, with instant reflection of code changes in the API. For more information, go to https://pylon.cronit.io
+url: https://pylon.cronit.io
+github: getcronit/pylon
+---
+
+Example service:
+
+```typescript
+import { defineService } from "@getcronit/pylon"
+
+class User {
+  name: string
+  email: string
+  constructor(name: string, email: string) {
+    this.name = name
+    this.email = email
+  }
+}
+
+const users = [
+  new User("Alice", "[email protected]"),
+  new User("Bob", "[email protected]"),
+  new User("Charlie", "[email protected]"),
+]
+
+export default defineService({
+  Query: {
+    users,
+    user: (name: string) => {
+      return users.find(user => user.name === name)
+    },
+    Mutation: {
+      addUser: (name: string, email: string) => {
+        const user = new User(name, email)
+        users.push(user)
+        return user
+      },
+    },
+  },
+})
+```
+
+After running the service, you can query it using GraphQL:
+
+```graphql
+query User {
+  user(name: "Alice") {
+    name
+    email
+  }
+}
+
+query Users {
+  users {
+    name
+    email
+  }
+}
+
+mutation AddUser {
+  addUser(name: "Corina", email: "[email protected]") {
+    name
+    email
+  }
+}
+```