Add CustomImageFormatConfigurator class.

app/src/main/java/chat/rocket/android/app/utils/CustomImageFormatConfigurator.kt

+package chat.rocket.android.app.utils
+
+import com.facebook.drawee.backends.pipeline.DraweeConfig
+import com.facebook.imagepipeline.decoder.ImageDecoderConfig
+
+/**
+ * Utility class to add custom decoders and drawable factories.
+ *
+ * @see {https://github.com/facebook/fresco/blob/master/samples/showcase/src/main/java/com/facebook/fresco/samples/showcase/CustomImageFormatConfigurator.java}
+ */
+object CustomImageFormatConfigurator {
+
+    fun createImageDecoderConfig() : ImageDecoderConfig {
+        return ImageDecoderConfig.newBuilder()
+                .addDecodingCapability(SvgDecoder.svgFormat, SvgDecoder.SvgFormatChecker(), SvgDecoder.Decoder())
+                .build()
+    }
+
+    fun addCustomDrawableFactories(draweeConfigBuilder: DraweeConfig.Builder) {
+        // We always add the color drawable factory so that it can be used for image decoder overrides.
+        draweeConfigBuilder.addCustomDrawableFactory(ColorImage.createDrawableFactory())
+        draweeConfigBuilder.addCustomDrawableFactory(SvgDecoder.SvgDrawableFactory())
+    }
+}
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