Merge pull request #5369 from prckent/exreadme

Add README in examples

Author: ye-luo

examples/README.md

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+This directory contains a limited number of examples of real-space QMC
+and AFQMC calculations.
+
+A large number of additional examples are provided in
+qmcpack/nexus/examples. These include full workflows for molecular and
+solid-state calculations including trial wavefunction generation with
+Quantum ESPRESSO, GAMESS, PySCF, RMG DFT, and Quantum
+Package. Examples are also given for the use of all estimators. In
+many cases the workflows can be quickly adapted for research level
+calculations.