Add quickstart (for PLG team's new Developer Hub)

Author: stefano-ottolenghi

modules/ROOT/partials/quickstart.adoc

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+== Install
+
+Install the Neo4j GraphQL library and its peer dependencies with `npm`.
+
+[source, bash]
+----
+npm install @neo4j/graphql@alpha graphql neo4j-driver @apollo/server
+----
+
+link:https://neo4j.com/docs/graphql/current/getting-started/[More info on installing the Neo4j GraphQL Library]
+
+
+== Connect to the database
+
+Connect to the Neo4j server via `neo4j.driver()` and your server credentials.
+
+[source, javascript]
+----
+import neo4j from "neo4j-driver";
+
+const driver = neo4j.driver(
+    "<neo4j-database-uri>",
+    neo4j.auth.basic("<username>", "<password>")
+);
+----
+
+
+== Set GraphQL type definitions
+
+Provide the GraphQL type definitions mapping to the nodes and relationships in your Neo4j database through `Neo4jGraphQL`.
+
+.Type definitions for node labels `Actor` and `Movie`
+[source, javascript]
+----
+import { Neo4jGraphQL } from "@neo4j/graphql";
+
+const typeDefs = `#graphql
+    type Movie @node {
+        title: String
+        actors: [Actor!]! @relationship(type: "ACTED_IN", direction: IN)
+    }
+
+    type Actor @node {
+        name: String
+        movies: [Movie!]! @relationship(type: "ACTED_IN", direction: OUT)
+    }
+`;
+
+const neoSchema = new Neo4jGraphQL({ typeDefs, driver });
+----
+
+
+== Create an instance of Apollo Server
+
+Start an `ApolloServer` instance drawing its schema from the Neo4j type definitions.
+Execute mutations and link:https://neo4j.com/docs/graphql/current/getting-started/#_create_nodes_in_the_database[create nodes in the database] through the Apollo server.
+
+[source, javascript]
+----
+import { ApolloServer } from '@apollo/server';
+import { startStandaloneServer } from '@apollo/server/standalone';
+
+const server = new ApolloServer({
+    schema: await neoSchema.getSchema(),
+});
+
+const { url } = await startStandaloneServer(server, {
+    listen: { port: 4000 },
+});
+
+console.log(`🚀 Server ready at ${url}`);
+----