Update README.md

Author: CorentinB

README.md

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+[![forthebadge](https://forthebadge.com/images/badges/built-with-love.svg)](https://forthebadge.com)[![forthebadge](https://forthebadge.com/images/badges/made-with-go.svg)](https://forthebadge.com)
+
 # DeepSort
 🧠 AI powered image tagger backed by DeepDetect
+
+# Prerequisites & installation
+
+You need Docker installed, and you need to pull the DeepDetect image.
+```
+docker pull beniz/deepdetect_cpu
+```
+
+First download the latest release from https://github.com/CorentinB/DeepSort/releases
+Make it executable with:
+```
+chmod +x deepsort
+```
+
+# Usage
+
+Just input a folder, and all files will begin to be renames all the pictures files the following way:
+```
+identified-image-class_original-name.ext
+```
+To start the tagging:
+```
+./deepsort FOLDER 
+```
+
+# Benchmark
+
+Tested on 605 files, it took 11m18s on an i7 7700K.