Update proto files and scripts

tx_ledger.proto

@@ -0,0 +1,37 @@
+syntax = "proto3";
+package api;
+
+import "common.proto";
+
+service TxLedger {
+    rpc CreateLedger (CreateLedgerRequest) returns (CreateLedgerResponse);
+    rpc GetLedgers (GetLedgersRequest) returns (GetLedgersResponse);
+    rpc SendMessage (SendMessageRequest) returns (SendMessageResponse);
+}
+
+message CreateLedgerRequest {
+    string name = 1;
+}
+message CreateLedgerResponse {
+    bool ok = 1;
+}
+
+message GetLedgersRequest {
+}
+message GetLedgersResponse {
+    repeated string ledgers = 1;
+}
+
+message SendMessageRequest {
+    string ledger = 1;
+    message Message {
+        MessageType type = 1;
+        bytes from = 2;
+        bytes to = 3;
+        bytes data = 4;
+    }
+    Message message = 2;
+}
+message SendMessageResponse {
+    bytes hash = 1;
+}