adds example for small->resize->large procedure

examples/resize_example.sh

+#! /bin/bash
+
+# Example TurTLE resize script
+
+# run "small" simulation
+turtle DNS NSVE \
+    -n 32 --simname test32
+
+# double the size of a specific snapshot (iteration 8 in this case)
+# it's probably a good idea to always give "new_simname" as "old_simnamex2",
+# but you are free to choose as appropriate.
+# TODO: the python script should create an appropriate parameter file for new_simname.
+turtle PP resize \
+    --simname test32 \
+    --iter0 8 --iter1 8 \
+    --new_nx 64 --new_ny 64 --new_nz 64 --new_simname test32x2
+
+# create a checkpoint symlink to the resized field
+ln -s test32x2_fields.h5 test32x2_checkpoint_0.h5
+
+# run "large" simulation using the resized field
+turtle DNS NSVE \
+    -n 64 --simname test64 \
+    --src-simname test32x2 --src-iteration 8
+