2TC: Add LICENSE file in root directory

[chbae]

Summary

Add LICENSE file in root directory for webOS OSE Contributhon 2TA

How to

Reference: https://github.com/webosce/luna-surfacemanager Add LICENSE(Apache-2.0,https://github.com/webosce/luna-surfacemanager/blob/master/LICENSE)

1. Create LICENSE file in the component repository
2. Copy text from https://github.com/webosce/luna-surfacemanager/blob/master/LICENSE to created LICENSE file
3. Commit in developers' github and request PR.

Components

• https://github.com/webosce/luna-downloadmgr
• https://github.com/webosce/ls2-helpers
• https://github.com/webosce/libwebosi18n
• https://github.com/webosce/libsandbox
• https://github.com/webosce/librolegen
• https://github.com/webosce/libpbnjson
• https://github.com/webosce/filecache
• https://github.com/webosce/event-monitor-network
• https://github.com/webosce/cpushareholder-stub
• https://github.com/webosce/configd-data
• https://github.com/webosce/configd
• https://github.com/webosce/cmake-modules-webos
• https://github.com/webosce/bootd
• https://github.com/webosce/applicationinstallerutility