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Update README.md

Add 'recent controls writing plan', 'existed controls missing features' English version description.
CrossApp alpha 0.1.4 Update (English Version)

CrossApp alpha 0.1.4 Update: Power Consumption Optimization, CAButton Modification, CASchedule and Demo Location Change
CrossApp alpha 0.1.5 Update (English version)

CrossApp alpha 0.1.5 Update (English version): Add CASwitch, Touch event dispatch rules modification, GPS location function and others
Update README.md
CrossApp alpha 0.1.6 Update (English version)

CrossApp alpha 0.1.6 Update: Add CASlider, CASegmentedControl. Touch event dispatch rules optimization, add CAResponder class, CATextField functions completion and others.
CrossApp alpha 0.1.7 Update (English version)
Update README.md
CrossApp alpha 0.1.8 Update (English version)

CrossApp alpha 0.1.8 Update
CrossApp alpha 0.1.9 Update (English version)

CrossApp alpha 0.1.9 Update
CrossApp alpha 0.1.10 Update (English version)

CrossApp alpha 0.1.10 Update