MycroftOS: Implementation of a very first initial bootable version

- Add Buildroot patches to downgrade / upgrade package dependencies
  in line with the Mycroft A.I. software stack requirements.
- Add buildroot additional package dependencies in line with the
  Mycroft A.I. software stack requirements.
- Update rpi3 defconfig file.
- Implement initial root_fs overlay filestructure.
- Addition of some quick and dirty helper scripts.
- Update of README to reflect these changes.

buildroot-external/package/python-speechrecognition/Config.in

@@ -0,0 +1,7 @@
+config BR2_PACKAGE_PYTHON_SPEECHRECOGNITION
+	bool "python-speechrecognition"
+	help
+	  Library for performing speech recognition, with 
+	  support for several engines and APIs, online and offline.
+
+	  https://github.com/Uberi/speech_recognition

buildroot-external/package/python-speechrecognition/python-speechrecognition.hash

@@ -0,0 +1,2 @@
+# Locally computed
+sha256	82d3313db383409ddaf3e42625fb0c3518231a1feb5e2ed5473b10b3d5ece7bd  python-speechrecognition-3.8.1.tar.gz

buildroot-external/package/python-speechrecognition/python-speechrecognition.mk

@@ -0,0 +1,14 @@
+################################################################################
+#
+# python-speechrecognition
+#
+################################################################################
+
+PYTHON_SPEECHRECOGNITION_VERSION = 3.8.1
+PYTHON_SPEECHRECOGNITION_SITE = $(call github,Uberi,speech_recognition,$(PYTHON_SPEECHRECOGNITION_VERSION))
+PYTHON_SPEECHRECOGNITION_LICENSE = Apache-2.0
+PYTHON_SPEECHRECOGNITION_LICENSE_FILES = LICENSE
+PYTHON_SPEECHRECOGNITION_SETUP_TYPE = setuptools
+
+$(eval $(python-package))
+$(eval $(host-python-package))