Add generated Java classes

src/main/java/bdchain/api/grpc/BlockNumberRequestOrBuilder.java

@@ -0,0 +1,19 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: bdchain/api/ac_chain.proto
+
+package bdchain.api.grpc;
+
+public interface BlockNumberRequestOrBuilder extends
+    // @@protoc_insertion_point(interface_extends:bdchain.api.BlockNumberRequest)
+    com.google.protobuf.MessageOrBuilder {
+
+  /**
+   * <code>string ledger = 1;</code>
+   */
+  java.lang.String getLedger();
+  /**
+   * <code>string ledger = 1;</code>
+   */
+  com.google.protobuf.ByteString
+      getLedgerBytes();
+}