Add README

Change-Id: I0a23aaba0bef99eafe5fec961dde97f61d772346
Signed-off-by: Sunmin Lee <sunm.lee@samsung.com>

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+                        Tizen System Update
+               Tizen OTA Update Package Generator (tota-upg)
+
+ Tizen System Update is the one of Tizen feature. This implements
+the functionality of firmware update base on OTA mechanism.
+
+* Notice of Limitations
+ This functionality does NOT support official signing & validation method.
+This means it requires proper mechanism for binary validation offered by each
+manufacturers.