Update 0003 RFC GraphQL API for Duniter Clients.md

rfc/0003 RFC GraphQL API for Duniter Clients.md

@@ -376,6 +376,57 @@ The SSL endpoint string is:
 
     GVAS [DNS] [IPv4] [IPv6] [PORT] [PATH]
 
+## API GraphQL Schema
+
+```GraphQL
+
+schema {
+  query: Query
+  mutation: Mutation
+}
+
+type Query {
+  node: Node
+}
+
+type Node {
+    summary: Summary
+    sandboxes: Sandboxes
+}
+
+type Summary {
+    software: String!
+    version: String!
+    forkWindowSize: Int!
+}
+
+interface Sandbox {
+    size: Int!
+    free: Int!
+}
+
+type IdentitiesSandbox implements Sandbox {
+    size: Int!
+    free: Int!
+}
+
+type MembershipsSandbox implements Sandbox {
+    size: Int!
+    free: Int!
+}
+
+type TransactionsSandbox implements Sandbox {
+    size: Int!
+    free: Int!
+}
+
+type Sandboxes {
+    identities: IdentitiesSandbox
+    memberships: MembershipsSandbox
+    transactions: TransactionsSandbox
+}
+
+```
 
 ---
 End of the document.