Add license file, remove third-party licenses file (#1192)

Add LICENSE file, remove ThirdPartyLicenses.txt, as most of the files it referred to have moved to the sonic-platform-common repo, and sfputil has been completely refactored.

Author: jleveque

LICENSE

@@ -0,0 +1,13 @@
+Copyright 2016-2020 Microsoft, Inc.
+
+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.