README.md and initialization script

Author: pietrushnic

README.md

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+This repository aim to provide container for building [Armbian](https://github.com/igorpecovnik/lib).
+
+Assumptions:
+
+* x86_64 Debian sid as host and container system
+* there should be minimal number of packets installed by Armbian
+* setup should simplify contribution (ie. using forked repo)
+
+Usage
+-----
+
+
+```
+git clone https://github.com/igorpecovnik/lib.git
+cd armbian-docker
+docker build -t 3mdeb/armbian .
+cd ..
+docker run -v ${PWD}/lib:/root/lib -t -i 3mdeb/armbian
+```
+
+Shorter way:
+
+```
+git clone https://github.com/3mdeb/armbian-docker.git
+cd armbian-docker
+REPO=git@github.com:3mdeb/lib.git ./init.sh
+```
+
+_NOTE_: you need access to `..`, also if `REPO` not provided
+`https://github.com/igorpecovnik/lib.git` will be used
+
+Development setup
+-----------------
+
+
+## Prepare repository
+
+Clone your Armbian fork:
+
+```
+git clone git@github.com:3mdeb/lib.git
+
+```
+
+Add Igor's repository as upstream:
+
+```
+cd lib
+git remote add upstream https://github.com/igorpecovnik/lib.git
+git fetch upstream
+```
+
+Pull recent changes if needed.
+
+## Run container
+
+```
+docker run -v ${PWD}/lib:/root/lib -t -i 3mdeb/armbian
+```
+
+Edit and commit your code on host side.

init.sh

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+#!/bin/bash
+
+: ${REPO:=https://github.com/igorpecovnik/lib.git}
+
+if [ ! -d  ../lib ]; then
+	git clone $REPO ../lib
+fi
+
+docker build -t 3mdeb/armbian .
+cd ..
+docker run -v ${PWD}/lib:/root/lib -t -i 3mdeb/armbian