Add a CheckBox.

[yourina]

Description of Change

Add a CheckBox Control to Xamarin.Forms.
A CheckBox is a specific control that has two states which are 'checked' and 'unchecked'.
A CheckBox allows the user to select multiple options among several items in a list.

Bugs Fixed

N/A

API Changes

A CheckBox Control has the following properties and event.:

Added:

• String Text { get; set; } A value for the text that is displayed as the content of the CheckBox. This is a bindable property.
• Color TextColor { get; set; } A value that indicates the color for the text of CheckBox. This is a bindable property.
• Font Font { get; set; } A value that indicates the font of the CheckBox. This is a bindable property.
• FontAttributes FontAttributes { get; set; } A value that indicates whether the font of the CheckBox is bold, italic or neither. This is a bindable property.
• String FontFamily { get; set; } A value that indicates the font family which the CheckBox font belongs to. This is a bindable property.
• Double FontSize { get; set; } A value that indicates the font size of the CheckBox. This is a bindable property.
• bool IsChecked { get; set; } A value that indicates whether the CheckBox is checked or not. This is a bindable property.
• event EventHandler Checked This event occurs when the CheckBox is checked or unchecked.

Behavioral Changes

N/A

PR Checklist

• Has tests (if omitted, state reason in description)
• Rebased on top of master at time of PR
• Changes adhere to coding standard
• Consolidate commits as makes sense

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[rmarinho]

Hi thanks for your contribution. This is a good start, but it needs more work.
A couple of suggestions:

• Add unit tests, a gallery page on the ControlGallery , if possible UITests for iOS and Android.
• Needs a iOS implementation
• Rebase the project.
• Fix indentation issues

Please reopen with good for another review.

[weitzhandler]

Related #1728.