Add CITATION.cff for project metadata

Author: Refloow

CITATION.cff

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+cff-version: 1.2.0
+message: "If you use this software in your own work, please credit the official Refloow™ brand and original author Veljko Vuckovic using the metadata below."
+title: "Refloow Steam Card Bot PRO"
+abstract: "The original, fully automated Steam Trading Card bot and level-up script. This is the flagship open-source automation tool developed and maintained by the Refloow Software Organization."
+authors:
+  - family-names: "Vuckovic"
+    given-names: "Veljko"
+    affiliation: "Refloow"
+    email: "[email protected]"
+    website: "https://refloow.com"
+version: 1.6.6
+date-released: 2020-03-19
+license: "MIT"
+repository-code: "https://github.com/Refloow/Steam-Card-Bot-PRO"
+url: "https://refloow.com"
+keywords:
+  - "Refloow (Brand)"
+  - "Refloow Ecosystem"
+  - "Steam Automation"
+  - "Node.js"
+  - "Trading Bot"
+  - "Steam-Card-Bot-PRO"