add graphql

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

graphql/graphql.proto

@@ -0,0 +1,63 @@
+syntax = "proto3";
+
+package micro.graphql;
+
+option go_package = "go.unistack.org/micro-proto/v4/graphql;graphql";
+
+import "google/protobuf/descriptor.proto";
+
+// TODO: Email protobuf-global-extension-registry@google.com to get an extension ID.
+
+extend google.protobuf.MethodOptions {
+    optional Rpc rpc = 65030;
+}
+
+extend google.protobuf.ServiceOptions {
+    optional Svc svc = 65030;
+}
+
+extend google.protobuf.FieldOptions {
+    optional Field field = 65030;
+}
+
+extend google.protobuf.OneofOptions {
+    optional Oneof oneof = 65030;
+}
+
+message Oneof {
+    optional bool ignore = 4;
+    optional string name = 5;
+}
+
+message Field {
+    optional bool required = 1;
+    optional string params = 2;
+    optional string dirs = 3;
+    optional bool ignore = 4;
+    optional string name = 5;
+}
+
+message Rpc {
+    optional Type type = 1;
+    optional bool ignore = 2;
+    optional string name = 3;
+}
+
+message Svc {
+    optional Type type = 1;
+    optional bool ignore = 2;
+    optional string name = 3;
+    optional Upstream upstream = 4;
+}
+
+enum Type {
+    DEFAULT = 0;
+    MUTATION = 1;
+    QUERY = 2;
+}
+
+enum Upstream {
+  UPSTREAM_UNSPECIFIED = 0;
+  UPSTREAM_SERVER = 1;
+  UPSTREAM_CLIENT = 2;
+}