added default generic runtime

default/descriptor.json

@@ -0,0 +1,18 @@
+{
+  "id":"https://code-repo.d4science.org/m.lettere/ccp.runtimes.docker.git",
+  "active":true,
+  "name":"default",
+  "description":"Default synthetic runtime for Docker based infrastructures for methods that provide images from a remote repository",
+  "keywords":[
+    "docker",
+    "dockerhub",
+    "public",
+    "default"
+  ],
+  "responsible":{
+    "name":"Marco Lettere",
+    "email":"m.lettere@gmail.com"
+  },
+  "type":"docker",
+  "image":"bash"
+}