add licensing info

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diff --git a/LICENSE b/LICENSE
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+
+Unless otherwise indicated, all content in this guide (including photos,
+diagrams, text, etc, but not including code snippets or scripts) are released
+under the Creative Commons Attribution license ("CC-BY 3.0"). Basically you can
+do whatever you want with it (even print it out and sell it) as long as you
+give give credit (eg, link back here).
+
+Unless otherwise indicated, all code snippets and scripts included in-line in
+this guide are considered short and trivial enough to be reused in any way
+under fair use guidelines, and additionally no attribtion is required. To be
+pedantic, all code snippets and in-line scripts are released under the Creative
+Commons Zero license ("CC0 1.0 Universal", commited into the international
+public domain to the greatest degree possible).
+
+Direct links to license texts:
+
+- https://creativecommons.org/licenses/by/3.0/
+- https://creativecommons.org/publicdomain/zero/1.0/