adding dask examples

examples/simple_instance.py

@@ -0,0 +1,24 @@
+from minerva.cluster  import Cluster
+from minerva.pier     import Pier
+
+def worker(pier, n=0):
+    mach = pier.machine(ami    = "ami-05a242924e713f80a",  # dask on ubuntu 22.04 x86
+                 instance_type = "t3.medium",
+                 username      = "ubuntu",
+                 name          = f"dask-client-{n}",
+                 variables     = {"type":   "worker",
+                                  "number": n})
+    return mach
+
+pier    = Pier("hay",
+               subnet_id = "subnet-05eb26d8649a093e1", # project-subnet-public1-us-east-1a
+               sg_groups = ["sg-0f9e555954e863954",    # ssh
+                            "sg-0b34a3f7398076545",    # default
+                            "sg-04cd2626d91ac093c"],   # dask (8786, 8787)
+               iam       = "S3+SSM+CloudWatch+ECR",
+               key_pair  = ("Ari-Brown-HAY", "~/.ssh/Ari-Brown-HAY.pem"))
+
+mach = worker(pier)
+mach.create()
+mach.login()
+