Add Src/Res/Img/AltBranding directory & images

This directory provides public domain placeholder images that can be
used in derived programs in place of CodeSnip's branding images that
are prohibited from use in derived programs.

There's also README.txt that explains the purpose of the directory.

Author: delphidabbler

Src/Res/Img/AltBranding/CodeSnip.ico

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+About the Src/Res/Img/AltBranding directory
+===========================================
+
+If you are creating a fork of CodeSnip, or a program based on it, then
+the CodeSnip license does not permit you to use the images in the
+`Src/Res/Img/Branding` directory. But, since CodeSnip expects to find
+the files `CodeSnip.ico`, `icon.gif` and `Splash.gif` in that directory,
+simply deleting the images will cause CodeSnip to fail to build.
+
+Alternative versions of the above images are provided in the
+`Src/Res/Img/AltBranding` directory. These files are Public Domain, and
+therefore can be used and modified in derived programs.
+
+Simply copy the image files from the `Src/Res/Img/AltBranding` directory
+into `Src/Res/Img/Branding`, overwriting the existing files. CodeSnip
+can then be built successfully without using the prohibited files.
+
+It is not expected that the images will be used as-is. They are provided
+only as placeholders to enable CodeSnip to build successfully.
+Evetually you may want to edit the images to meet your needs.
+Alternatively, the CodeSnip source could be changed so that the images
+are not required at all.
+
+Because the files are Public Domain, you may relicense any modified
+version as you wish.
+
+
+Information about the files
+---------------------------
+
+`CodeSnip.ico`
+
+  This is the program's main icon.
+
+  It contains images at four different resolutions: 16×16, 32×32, 48×48
+  and 256×256 pixels.
+
+`icon.gif`
+
+  A 32×32 pixel GIF file that is displayed in the About box.
+
+`Splash.gif`
+
+  A 325×155 pixel GIF image that is displayed as a splash screen while
+  the program is loading.
+
+  The program's version number is overlaid in the bottom quarter of the
+  image.