added working graphql 4 module and started materio_graphql

web/modules/custom/materio_graphql/graphql/materio_extension.base.graphqls

@@ -0,0 +1,40 @@
+type Mutation
+
+scalar Violation
+
+type Materiau {
+  id: Int!
+  uuid: String!
+  title: String!
+  author: String
+  memo: String
+  linked_materials: [Materiau]
+  images: [Image]
+}
+
+type MateriauResponse implements Response {
+  errors: [Violation]
+  materiau: Materiau
+}
+
+interface Response {
+  errors: [Violation]
+}
+
+input MateriauInput {
+  title: String!
+  description: String
+}
+
+type Image {
+  id: Int!
+  url: String!
+  alt: String
+  style_minicard: ImageStyle
+}
+
+type ImageStyle {
+  width: Int
+  height: Int
+  url: String
+}

web/modules/custom/materio_graphql/graphql/materio_extension.extension.graphqls

@@ -0,0 +1,7 @@
+extend type Query {
+  materiau(id: Int!): Materiau
+}
+
+extend type Mutation {
+  createMateriau(data: MateriauInput): MateriauResponse
+}