Add README.md

Signed-off-by: Valentin Raevsky <[email protected]>

README.md

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+# Disclaimer
+
+| !IMPORTANT! | This is a development branch, that is not relelased by CompuLab yet|
+|---|---|
+
+# Configuring the build
+
+## Prerequisites
+It is up to developers to prepare the host machine; it requires:
+
+* [Setup Cross Compiler](https://github.com/compulab-yokneam/meta-bsp-imx8mp/blob/kirkstone/Documentation/toolchain.md#linaro-toolchain-how-to)
+* Install these packages: ``shareutils, swing``
+
+
+## Setup U-Boot environment
+
+* WorkDir:
+```
+mkdir -p compulab-bootloader/build && cd compulab-bootloader
+export BUILD=$(pwd)/build
+```
+
+* Set a CompuLab machine:
+
+| Machine | Command Line |
+|---|---|
+|ucm-imx8m-plus|```export MACHINE=ucm-imx8m-plus```|
+|som-imx8m-plus|```export MACHINE=som-imx8m-plus```|
+|iot-gate-imx8plus|```export MACHINE=iot-gate-imx8plus```|
+
+* Clone the source code:
+```
+git clone --branch u-boot-compulab_v2021.04 https://github.com/compulab-yokneam/u-boot-compulab.git
+cd u-boot-compulab
+```
+
+## Create U-boot binary
+
+* Apply the machine Config
+```
+make O=${BUILD} ${MACHINE}_defconfig
+```
+
+* Build
+```
+nice make -j`nproc` O=${BUILD} flash.bin
+```
+
+* Result
+```
+ls -al ${BUILD}/flash.bin
+```