Add package grpc_client to the index

index/grpc_client.mk

@@ -0,0 +1,7 @@
+PACKAGES += grpc_client
+pkg_grpc_client_name = grpc_client
+pkg_grpc_client_description = gRPC client in Erlang
+pkg_grpc_client_homepage = https://github.com/Bluehouse-Technology/grpc_client
+pkg_grpc_client_fetch = git
+pkg_grpc_client_repo = https://github.com/Bluehouse-Technology/grpc_client
+pkg_grpc_client_commit = master