create/update 'Imagus Seive Grants.md' file

Imagus Seive Grants.md

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+# Imagus Seive Grants
+
+Imagus is a [Firefox](https://addons.mozilla.org/en-US/firefox/addon/imagus/)/[Chrome](https://chrome.google.com/webstore/detail/imagus/immpkjjlgappgfkkfieppnmlhakdmaab?hl=en) extension that allows you to enlarge images with a simple mouse-over. (hover-zoom)
+
+### Option 1
+
+Disabling image zoom on certain sites
+
+```
+!:youtube.com
+!:photos.google.com
+!:www.shudder.com
+!:twitter.com
+!:libbyapp.com
+
+```
+
+### Option 2
+
+Excludes everything and allows you to add only the sites on which you want to use hover-zoom
+
+```
+!:*
+~:reddit.com/
+
+```
+
+Note: this extension's options DO NOT sync with Firefox Sync
+
+- [subreddit](https://www.reddit.com/r/imagus/)