RIoT application quickstart guide added

Signed-off-by: Antal Wu-Hen-Chang <antal.wu-hen-chang@ericsson.com>
diff --git a/doc/riot_quickstart_guide.docx b/doc/riot_quickstart_guide.docx
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diff --git a/doc/riot_quickstart_guide.pdf b/doc/riot_quickstart_guide.pdf
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