add license

Author: Neutree

LICENSE.md

@@ -0,0 +1,28 @@
+
+License
+======
+
+All the source code in this repository is released under LGPL or Apache v2.0 license even more.
+
+
+All the sources created/modified by the repository owner are released under Apache v2.0 license and contains the following copyright notice:
+Copyright 2019 Sipeed Co.,Ltd.
+
+Most of the source files contains license and copyright notice, please check the individual files for more information.
+Also check the license information in individual components directories.
+
+```
+Copyright 2019 Sipeed Co.,Ltd.
+  
+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.
+```