update the read me file.

Update the read me document.

Update the program setup section.

update the design document section.

update the device verification section.

update the read me introduction section.

Merge branch 'master' of https://github.com/LiuYuancheng/Raspberry_PI_OPTEE into master

update the read me file.

Create LICENSE

Update the read me file and add the design document.

added the execution document.

update readme.

updated the readme.

Step4

step3 program flow.