Add high-level description for QSBR

Author: jserv

qsbr/README.md

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+# Quiescent-State-Based Reclamation
+
+Designing high throughput server is hard. One of the problems we often
+encounter is how to update internal data-structure that sustain mostly
+read traffic. 
+
+Tom Hard and PE McKenney conducted a thorough comparison of most
+performant implementations within this scheme. One of them is a
+cooperative algorithm called "Quiescent-State-Based Reclamation".