Add AkariApi gRPC service

Akari.Prototype.Server/Protos/akari.proto

@@ -0,0 +1,37 @@
+syntax = "proto3";
+
+option csharp_namespace = "Akari.Prototype.Protos";
+
+package akari;
+
+service AkariApi {
+  rpc Encrypt (EncryptRequest) returns (EncryptResponse);
+
+  rpc Decrypt (DecryptRequest) returns (DecryptResponse);
+}
+
+message EncryptRequest {
+  string application = 1;
+  string token = 2;
+  bytes plain = 3;
+}
+
+message EncryptResponse {
+  oneof response {
+    string error_message = 1;
+    bytes encrypted = 2;
+  }
+}
+
+message DecryptRequest {
+  string application = 1;
+  string token = 2;
+  bytes encrypted = 3;
+}
+
+message DecryptResponse {
+  oneof response {
+    string error_message = 1;
+    bytes plain = 2;
+  }
+}