add readme

Change-Id: Ic263ff5033c0bd71fa2209c86fafc1333e1bf70c

readme.md

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+Copyright 2015 - The CyanogenMod Project
+
+Device configuration for LG Optimus L90.
+=====================================
+
+Basic   | Spec Sheet
+-------:|:-------------------------
+CPU     | Quad-core 1.2 GHz Cortex-a7
+CHIPSET | Qualcomm MSM8226 Snapdragon 400 (28 nm)
+GPU     | Adreno 305
+Memory  | 1GB RAM
+Shipped Android Version | 4.4.2
+Storage | 8GB
+Battery | 2540 mAh
+Display | 960 x 540 pixels, 4.7 in IPS LCD (~234 DPI)
+Rear Camera  | 5 MP (3464 x 2312)
+Front Camera | 0.3 MP (VGA - (640x480))
+
+
+![LG L90](http://www.lg.com/ae/images/mobile-phones/l90-d410/gallery/smart-phone-l90-d410-450x370-01.jpg "LG L90")
+