Add license file for the repository

Cover binary release and source code tools.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Change-Id: I71287e04f887a726ec316d297b9a0b1feb96c2b3

LICENSE

@@ -0,0 +1,22 @@
+Copyright © 2017-2023 ，Rockchip Electronics Co., Ltd. All rights reserved.
+
+BY DOWNLOADING, COPYING, SAVING OR OTHERWISE USING THIS SOFTWARE, YOU
+ACKNOWLEDGE THAT YOU AGREE THE SOFTWARE RECEIVED FORM ROCKCHIP IS PROVIDED TO
+YOU ON AN "AS IS" BASIS and ROCKCHP DISCLAIMS ANY AND ALL WARRANTIES AND
+REPRESENTATIONS WITH RESPECT TO SUCH SOFTWARE, WHETHER EXPRESS, IMPLIED,
+STATUTORY OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY IMPLIED WARRANTIES OF
+TITLE, NON-INFRINGEMENT, MERCHANTABILITY, SATISFACTROY QUALITY, ACCURACY OR
+FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL ROCKCHIP BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+LIABILITY, OR TORT ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+Rockchip hereby grants to you a non-exclusive license (a) to use, copy,
+distribute the Software; (b) to modify any source code as part of Software(if
+any) and sublicense, distribute such modifications.
+Except as expressively authorized by Rockchip in writing, you may NOT:
+(a) decompile, reverse-engineer, dissemble, or attempt to derive any source
+code from the Software;
+(b) remove or obscure any copyright, patent, or trademark statement or notices
+contained in the Software.