As first you need elementary SDK
sudo apt install elementary-sdk
Install dependencies
sudo apt install libsqlite3-dev libgexiv2-dev libraw-dev webkit2gtk-4.0
Clone repository and change directory
git clone https://github.com/artemanufrij/showmypictures.git
cd showmypictures
Create build folder, compile and start application
mkdir build
cd build
cmake -DCMAKE_INSTALL_PREFIX=/usr ..
make
Install and start Show My Pictures on your system
sudo make install
com.github.artemanufrij.showmypictures