Add initial revision of a Known Issues wiki page

Known-Issues.md

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+# Known Barrier issues
+
+This issues are some of the most common ones reported, and we aim
+
+(Please feel free to make PRs here [here][wiki_repo])
+
+- Some AV software detecting Barrier as malware:
+  We are aware that some [AV software detects](av_issue) Barrier as
+  malware.
+
+  Please be rest assured that Barrier _does not_ contain malware in
+  the source code. However, we cannot guarantee that all channels
+  where Barrier is distributed are free of malware.
+
+  Please feel free to inspect Barrier's [source code][src_code].
+
+
+[wiki_repo]: https:/github.com/debauchee/barrier-wiki
+[av_issue]: https://github.com/debauchee/barrier/issues/666
+[src_code]: https://github.com/debauchee/barrier.git