(master) Crée une configuration Docker pour l'harmonisation du volume des fichiers sons

.docker/normalize/normalize.md

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+# Noramlizing audio level
+
+> Audio normalization is the application of a constant amount of gain to an audio recording to bring the amplitude to a target level (the norm). Because the same amount of gain is applied across the entire recording, the signal-to-noise ratio and relative dynamics are unchanged. Normalization is one of the functions commonly provided by a digital audio workstation. https://en.wikipedia.org/wiki/Audio_normalization
+
+In other words, normalizing Kaamelott sounds allow each sound to have a ~same perceived audio loudness. So it reduce the volume of very loud sound and increase the volume of less audible ones. 
+
+## Prerequisite
+
+- install `ffmpeg`  using your preferred package managed (brew or apt-get for eg) or [this link](https://www.ffmpeg.org/download.html)
+- install `ffmpeg-normalize` following [this](https://github.com/slhck/ffmpeg-normalize#installation)
+
+With Docker:
+
+```
+docker build -t ks-normalize .docker/normalize/
+```
+
+## Usage
+
+Normalize a given sound file
+
+```
+docker run --rm -v $(pwd):$(pwd) -w $(pwd) ks-normalize sounds/victoriae_mundis.mp3
+```
+It will copy replace the file with the new normalized sound to `victoriae_mundis.mp3`.