further Nomad documentation

Signed-off-by: Travis Glenn Hansen <travisghansen@yahoo.com>

docs/Nomad/README.md

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+# setup
+
+```
+cat <<EOF > /etc/nomad.d/csi.hcl
+plugin "docker" {
+  config {
+    allow_privileged = true
+    volumes {
+      # required for bind mounting host directories
+      enabled = true
+    }
+  }
+}
+```

docs/Nomad/examples/job-mysql.hcl

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+job "mysql-server" {
+  datacenters = ["dc1"]
+  type        = "service"
+
+  group "mysql-server" {
+    count = 1
+
+    volume "mysql" {
+      type      = "csi"
+      read_only = false
+      
+      # iscsi
+      source    = "csi-volume-iscsi"
+      access_mode = "single-node-writer"
+      attachment_mode = "file-system"
+
+      # nfs
+      #source    = "csi-volume-nfs"
+      #access_mode = "multi-node-multi-writer"
+      #attachment_mode = "file-system"
+    }
+
+    network {
+      port "db" {
+        static = 3306
+      }
+    }
+
+    restart {
+      attempts = 10
+      interval = "5m"
+      delay    = "25s"
+      mode     = "delay"
+    }
+
+    task "mysql-server" {
+      driver = "docker"
+
+      volume_mount {
+        volume      = "mysql"
+        destination = "/srv"
+        read_only   = false
+      }
+
+      env {
+        MYSQL_ROOT_PASSWORD = "password"
+      }
+
+      config {
+        image = "hashicorp/mysql-portworx-demo:latest"
+        args  = ["--datadir", "/srv/mysql"]
+        ports = ["db"]
+      }
+
+      resources {
+        cpu    = 500
+        memory = 1024
+      }
+
+      service {
+        name = "mysql-server"
+        port = "db"
+      }
+    }
+  }
+}

docs/Nomad/examples/volume-iscsi.hcl

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+type = "csi"
+id = "csi-volume-iscsi"
+name = "csi-volume-iscsi"
+plugin_id = "org.democratic-csi.iscsi"
+capacity_min = "1GiB"
+capacity_max = "1GiB"
+
+capability {
+  access_mode     = "single-node-writer"
+  attachment_mode = "file-system"
+}

docs/Nomad/examples/volume-nfs.hcl

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+type = "csi"
+id = "csi-volume-nfs"
+name = "csi-volume-nfs"
+plugin_id = "org.democratic-csi.nfs"
+capacity_min = "1GiB"
+capacity_max = "1GiB"
+
+capability {
+  access_mode     = "multi-node-multi-writer"
+  attachment_mode = "file-system"
+}