add example 3 in GMD

Author: enigne

examples/example3_Helheim_Transient/Helheim_Basin.exp

@@ -0,0 +1,52 @@
+## Name:Helheim_Big_sub_3_2_6
+## Icon:0
+# Points Count Value
+46 1.000000
+# X pos Y pos
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+278952.0312500000 -2603124.5000000000
+275313.0312500000 -2605125.7500000000
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+269174.8750000000 -2607867.0000000000
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+238393.3515625000 -2598699.3353172098
+238393.3515625000 -2487654.2500000000
+