Created schdiff (markdown)

schdiff.md

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+## About
+
+A tool to show graphical "Diffs" or differences between schematics
+
+## Usage
+
+schdiff <schematic1>.sch <schematic2>.sch
+
+## Use with Git
+
+1.  Create a .gitattribute file in the project root with the line \*.sch
+    -crlf -diff. This tells git not to try text-diffing schematics.
+2.  See [this
+    patch](http://comments.gmane.org/gmane.comp.cad.geda.user/42179) for
+    schdiff usage in gEDA 1.9.X. (If link is broken search the mailing
+    list archive for "schdiff and gEDA/gaf 1.9"
+3.  See [this patch](http://bugs.launchpad.net/geda/+bug/904633) if
+    schdiff shows missing symbols when used with git
+
+## References
+
+[Binary File Diffs - Git
+Book](http://git-scm.com/book/en/Customizing-Git-Git-Attributes#Binary-Files)
+Also see [gschemdiff](gschemdiff "wikilink")