Add Cu's init_surf examples. (#406)

* Add Cu's init_surf examples.

* Delete personal information

* Update examples/init/cu.surf.hcp.111.json

Co-authored-by: Jinzhe Zeng <jinzhe.zeng@rutgers.edu>

Co-authored-by: Han Wang <amcadmus@gmail.com>
Co-authored-by: Jinzhe Zeng <jinzhe.zeng@rutgers.edu>

examples/init/cu.surf.hcp.111.json

@@ -0,0 +1,56 @@
+{
+  "_comments": "This is an example to generate Cu-hcp surface configurations.",
+  "_comments": "This example is used in Computer Physics Communications, 2020, 107206.",
+  "_comments" : "Last modified on 2019.8.27 by Yuzhi Zhang.",
+  "stages": [
+    1,
+    2
+  ],
+  "cell_type": "hcp",
+  "latt": 3.63,
+  "super_cell": [
+    1,
+    1,
+    1
+  ],
+  "z_min": 10,
+  "vacuum_max": 10,
+  "vacuum_resol": [
+    0.5,
+    1
+  ],
+  "mid_point": 4.0,
+  "millers": [
+    [
+      1,
+      0,
+      0
+    ],
+    [
+      1,
+      1,
+      0
+    ],
+    [
+      0,
+      0,
+      1
+    ]
+  ],
+  "elements": [
+    "Cu"
+  ],
+  "potcars": [
+    "PATH/POTCAR"
+  ],
+  "relax_incar" : "PATH/INCAR_surf_rlx",
+  "scale": [
+   0.96,0.98, 1.0,1.02, 1.04, 1.06
+  ],
+  "skip_relax": false,
+  "pert_numb": 20,
+  "pert_box": 0.03,
+  "pert_atom": 0.01,
+  "lmp_cmd" : "PATH/lmp_serial",
+  "_comment": "that's all"
+}