[u-boot-mgr]: Initial u-boot mgr hardening intf

Initial u-boot mgr to harden interface and usage. This
exposes method in D-Bus which other daemon can use to update
U-Boot environment variables, instead of directly using
fw_printenv  or fw_setenv tools.

Tested:
Verified able to query the ReadAll, Read and Write
method exposed in this interface.

Signed-off-by: Richard Marian Thomaiyar <richard.marian.thomaiyar@linux.intel.com>
Change-Id: I21772c8f30b7c68f5c9a2da3d44217ea2f533014
diff --git a/src/mainapp.cpp b/src/mainapp.cpp
new file mode 100644
index 0000000..14d352f
--- /dev/null
+++ b/src/mainapp.cpp
@@ -0,0 +1,30 @@
+/*
+// Copyright (c) 2019 Intel Corporation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+*/
+
+#include "u-boot-env-mgr.hpp"
+#include <phosphor-logging/log.hpp>
+
+int main()
+{
+    boost::asio::io_service io;
+    auto conn = std::make_shared<sdbusplus::asio::connection>(io);
+    conn->request_name(uBootEnvMgrServiceName);
+    sdbusplus::asio::object_server server(conn);
+
+    UBootEnvMgr uBootEnvMgr(io, server, conn);
+
+    io.run();
+}