Add Darkroom to the Images section (#2598)

README.md

@@ -817,6 +817,7 @@ See [go-hardware](https://github.com/rakyll/go-hardware) for a comprehensive lis
 * [bild](https://github.com/anthonynsimon/bild) - Collection of image processing algorithms in pure Go.
 * [bimg](https://github.com/h2non/bimg) - Small package for fast and efficient image processing using libvips.
 * [cameron](https://github.com/aofei/cameron) - An avatar generator for Go.
+* [darkroom](https://github.com/gojek/darkroom) - An image proxy with changeable storage backends and image processing engines with focus on speed and resiliency.
 * [geopattern](https://github.com/pravj/geopattern) - Create beautiful generative image patterns from a string.
 * [gg](https://github.com/fogleman/gg) - 2D rendering in pure Go.
 * [gift](https://github.com/disintegration/gift) - Package of image processing filters.