Update Preview image and add Media folder for badges

Media/MediaFolder_README.md

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+## Media Pack
+
+This folder contains PNG images and Inkscape SVG vector source graphic files for the following:
+
+* Mod preview images (CE, CE Guns, CE Melee)
+* Badges (CE Official Content, CE Compatible)
+* A large CE logo (the same as used on the official Discord channel)
+* Headings for Steam Workshop description subsections
+
+The font used is Bahnschrift, with a font weight of 600 and 75 (%) width. The TrueType Font (TTF) file is also included in the media folder.
+
+### For CE Maintainers
+
+Include the following badge graphic in your mod descriptions, to identify that your mod is part of the official "Core" Combat Extended mod family (e.g. CE Guns, CE Melee).
+
+_(Note: Right-click on this image and select `Copy Image Location`, so that you are always referencing the latest version of the badge on the GitHub repo)_
+
+![CE Official Content Badge](Badge_CE_official.png)
+
+### For Third-Party Mod Authors
+
+Include the following badge graphic in your mod descriptions, to identify that your mod is compatible with Combat Extended.
+
+_(Note: Right-click on this image and select `Copy Image Location`, so that you are always referencing the latest version of the badge on the GitHub repo)_
+
+![CE Compatibility Badge](Badge_CE_compatible.png)