feat: Add GraphQL support

lib/graphql.js

@@ -0,0 +1,14 @@
+import { createGraphQLSchema } from 'openapi-to-graphql';
+import { graphqlHTTP } from 'express-graphql';
+import fs from 'fs';
+import path from 'path';
+
+const openApiSpec = JSON.parse(fs.readFileSync(path.resolve(__dirname, '../openapi/swagger.json'), 'utf8'));
+const graphqlSchema = createGraphQLSchema(openApiSpec);
+
+export default function(app) {
+  app.use('/graphql', graphqlHTTP({
+    schema: graphqlSchema,
+    graphiql: true
+  }));
+}