Update readme.

Signed-off-by: CyberZHG <CyberZHG@gmail.com>
Merge branch 'cpp' of https://github.com/CyberZHG/ZMatrix.git
Update readme.

Signed-off-by: CyberZHG <CyberZHG@gmail.com>
Merge branch 'cpp'
Merge branch 'cpp'
Update readme.

Signed-off-by: CyberZHG <CyberZHG@gmail.com>
Merge branch 'cpp'
Add Doolittle LU decompose.
Change to short name.
Merge branch 'cpp_test' of https://github.com/CyberZHG/ZMatrix
Update change log.