Added GraphQL samples to SUMMARY.md.
* [JavaScript Samples](https://github.com/tonlabs/sdk-samples)
* [GraphQL Samples](./graphql-samples/README.md)
+ * [Quick Start](graphql-samples/quick-start.md)
+ * [Network Config](graphql-samples/network-config.md)
+ * [Block Queries](graphql-samples/blocks.md)
+ * [Account Queries](graphql-samples/accounts.md)
+ * [Transaction Queries](graphql-samples/transactions.md)
+ * [Blockchain Queries](graphql-samples/blockchain.md)
+ * [Statistics Queries](graphql-samples/statistics.md)
+ * [Counterparites Queries](graphql-samples/counterparties.md)
## guides
