Inclusion of other techniques

[DonaldTsang]

Please take a look at https://github.com/ChaofWang/Awesome-Super-Resolution and https://github.com/YapengTian/Single-Image-Super-Resolution for other algorithms that you can implement in order to be complete.

Also other parts of interest:

• https://github.com/xiaomi-automl/FALSR
• https://github.com/huangzehao/Super-Resolution.Benckmark
• https://github.com/jbhuang0604/SelfExSR
• https://github.com/thstkdgus35/EDSR-PyTorch
• https://github.com/yulunzhang/RCAN
• https://github.com/limbee/NTIRE2017
• https://github.com/yulunzhang/RDN
• https://github.com/Paper99/SRFBN_CVPR19