Begin adding documentation

docs/features.md

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+---
+title: "Features"
+---
+
+Below is a list of all the supported CSS properties and values.
+
+ - background
+   - background-clip (**Does not support `text`**)
+   - background-color
+   - background-image
+       - url()
+       - linear-gradient()
+   - background-origin 
+   - background-position
+   - background-size   
+ - border
+   - border-color
+   - border-radius
+   - border-style (**Only supports `solid`**)
+   - border-width
+ - bottom
+ - box-sizing
+ - content (**Does not support `attr()`**)
+ - color
+ - display
+ - flex
+ - float
+ - font
+   - font-family
+   - font-size
+   - font-style
+   - font-variant
+   - font-weight
+ - height
+ - left
+ - letter-spacing
+ - margin
+ - opacity
+ - overflow
+ - padding
+ - position
+ - right
+ - text-align
+ - text-decoration
+   - text-decoration-color
+   - text-decoration-line
+   - text-decoration-style (**Only supports `solid`**)
+ - text-shadow
+ - text-transform 
+ - top
+ - transform (**Limited support**)
+ - visibility
+ - white-space
+ - width
+ - word-spacing
+ - z-index
+    
+## Unsupported CSS properties
+These CSS properties are **NOT** currently supported
+ - [background-blend-mode](https://github.com/niklasvh/html2canvas/issues/966)
+ - [box-shadow](https://github.com/niklasvh/html2canvas/pull/1086)
+ - [filter](https://github.com/niklasvh/html2canvas/issues/493)
+ - [font-variant-ligatures](https://github.com/niklasvh/html2canvas/pull/1085)
+ - [list-style](https://github.com/niklasvh/html2canvas/issues/177)
+ - word-break
+ - [writing-mode](https://github.com/niklasvh/html2canvas/issues/1258)
+