README.md: Add file

Signed-off-by: Andrei Gherzan <andrei@resin.io>

README.md

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+#  resin-artik710 repository
+
+## Clone/Initialize the repository
+
+There are two ways of initializing this repository:
+* Clone this repository with "git clone --recursive".
+
+or
+
+* Run "git clone" and then "git submodule update --init --recursive". This will
+bring in all the needed dependencies.
+
+## Build information
+
+### Build flags
+
+* Consult layers/meta-resin/README.md for info on various build flags (setting
+up serial console support for example) and build prerequisites. Build flags can
+be set by using the build script (barys) or by manually modifying `local.conf`.
+
+See below for using the build script.
+
+### Build this repository
+
+* Run the build script:
+  `./resin-yocto-scripts/build/barys`
+
+* You can also run barys with the -h switch to inspect the available options
+
+### Custom build using this repository
+
+* Run the build script in dry run mode to setup an empty `build` directory
+    `./resin-yocto-scripts/build/barys --remove-build --dry-run`
+
+* Edit the `local.conf` in the `build/conf` directory
+
+* Prepare build's shell environment
+    `source layers/poky/oe-init-build-env`
+
+* Run bitbake (see message outputted when you sourced above for examples)