Create README.md

Author: DanteyPL

README.md

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+# Containerized environment for building NetPass with docker
+## Prerequisites
+- Running Linux OS 
+- Installed docker engine from [docker.io](https://docs.docker.com/desktop/install/linux-install/)
+## Building environment
+To build the environment image - run command:
+```bash
+cd netpass-docker-builder
+docker build -t netpass_builder -f ./Dockerfile ./
+```
+Build environment image need to be created once and recreated with the same command every time `Dockerfile` changed.
+## Compilation with Docker 
+Checkout original NetPass source and inside run command: 
+```bash
+docker run --rm -v ./:/build/source -u $(id -u):$(id -g) -ti netpass_builder
+```
+
+By default builder will execute command `make clean codegen;make cia`, to override arguments to `make` add at the end of previous command arguments of your choose. 
+
+Example:
+```bash
+docker run --rm -v ./:/build/source -u $(id -u):$(id -g) -ti netpass_builder clean
+```
+This will run command `make clean` overriding default arguments