Add doc about Docker image.

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+# Build the project using Docker
+A [Docker image (Dockerfile)](../docker) containing all the build environment is available for X86_64 and AMD64 architectures. This image makes the build of the firmware and the generation of the DFU file for OTA.
+
+## Build the image
+The image is not (yet) available on DockerHub, you need to build it yourself, which is quite easy. The following commands must be run from the root of the project.
+
+If you are running on a x86_64 computer : 
+```
+docker image build -t infinitime-build docker/x86_64/
+```
+
+And if your are running on an ARM64 device (tested on RaspberryPi4 and Pine64 PineBookPro):
+```
+docker image build -t infinitime-build docker/arm64/
+```
+
+This operation will take some time. It builds a Docker image based on Ubuntu, install some packages, download the ARM toolchain, the NRF SDK, MCUBoot and adafruit-nrfutil.
+
+When this is done, a new image named *infinitime-build* is available.
+
+## Run a container to build the project:
+
+```
+docker run --rm -v <project_root>:/sources infinitime-build
+```
+
+Replace *<project_root>* by the path of the root of the project on your computer. For example:
+
+```
+docker run --rm -v /home/jf/git/PineTime:/sources infinitime-build
+```
+
+This will start a container, build the firmware and generate the MCUBoot image and the DFU file. The output of the build is stored in **<project_root>/built/output**.
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