Added a document for warning against false positives

Author: CemraJC

WARNING.md

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+# Warning About False Positives
+
+> tldr; sometimes, crappy antivirus programs call ClickFix a virus. It isn't.
+
+Because ClickFix needs to monitor clicks and decide which ones to allow through
+to the underlying system, sometimes poorly made antivirus software will flag it
+as malicious. This diagnosis is a **false positive.** As long as you downloaded
+the ClickFix.exe program through a secure connection to the [main site][main] or
+from the [Github releases page][releases] then its integrity is ensured.
+
+The full source of ClickFix is uploaded to *this* Github repository. If you
+would like to verify that the code behind the program is not dangerous, read
+through [the main script][script] or compile it yourself with [AutoHotKey][ahk].
+
+If you are having trouble with ClickFix being blocked by antivirus software, add
+an exception for the ClickFix executable. If your software does not allow you to
+add exceptions, please consider replacing it with a better antivirus program (I
+personally recommend Avira or Avast - both have free versions).
+
+[main]: https://clickfix.cf
+[releases]: https://github.com/cemrajc/clickfix/releases/latest
+[script]: https://github.com/cemrajc/clickfix/blob/master/ClickFix.ahk
+[ahk]: http://ahkscript.org