Add note about performance.

Signed-off-by: Krzysztof Wilczynski <krzysztof.wilczynski@linux.com>
Add .gitignore file.

Signed-off-by: Krzysztof Wilczynski <krzysztof.wilczynski@linux.com>
Add license details etc ...

Signed-off-by: Krzysztof Wilczynski <krzysztof.wilczynski@linux.com>