Create README.md

Author: Kimon Kar

README.md

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+# xivapi-js
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+Welcome! This is a pure JS wrapper for interacting with [XIVAPI](https://xivapi.com/) and handling all requests in a simple, promise-driven manner.
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+Check out the [wiki](https://github.com/TheSacredPixel/xivapi-js/wiki) for usage help!