changed the named of the scheduling policy documentation to SchedulingPolicies.md. Also, added a documentation for power-capping strategies called PowerCappingStrategies.md

power-capping/PowerCappingStrategies.md

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+Elektron: Power-Capping Strategies
+==================================
+
+##__Power-Capping Policies__
+
+* **Extrema** - A dynamic power-capping strategy that is able to make smart trade-offs
+between makespan and power consumption. *Extrema* reacts to power trends in the
+cluster and restrains the power consumption of the cluster to a power
+envelope defined by a high threshold and low threshold.
+* **Progressive-Extrema** - A modified version *Extrema* that performs
+power-capping in phases. Unlike in *Extrema*, where picking a previously
+capped node as a victim resulted in a NO-OP, *Progressive-Extrema* applies
+a harsher capping value for that victim.