Add ReadMe file

UrlCardControl/README.md

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+# URL Preview Card
+No effort URL Preview Card that displays the URL metadata like title, description, domain & image information as a card.
+
+### Configure the control
+Control has 1 optional configuration properities described below:
+
+Configuration Property | Description | Required
+------------ | ------------- | -------------
+Link Preview Api Key | Api Key for link preview. Create your key here ▶ linkpreview.net. It is optional, if you do not create it then my free API key will be used | No
+
+### Demo & Setup of the control
+[![URLPreview-DemoVideo](https://img.youtube.com/vi/YTCAIDg3J7U/0.jpg)](https://youtu.be/YTCAIDg3J7U)
+