Add crash-only software dir + articles

crash_only/README.md

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+# Crash-Only Software
+
+* [Crash-Only Software](https://www.usenix.org/legacy/events/hotos03/tech/full_papers/candea/candea.pdf) by Candea and Fox.
+* [Microreboot -- A technique for cheap recovery](https://www.usenix.org/legacy/event/osdi04/tech/full_papers/candea/candea.pdf) by Candea, Kawamoto, Fujiki, Friedman, Fox. Follows up on the original crash-only paper to outline a broader strategy of failure management.