reivsed json files

README.md

 #### quick start
 
 ```
-$ choppy batch junshang/catreads-latest sample.json --project-name Your_project_name
+$ choppy batch junshang/catreads-latest sample.json -p Your_project_name
 ```
 
 #### Input File
     "oss://choppy-cromwell-result/test-choppy/..._lane3_1.fq.gz"
   ],
   "panel_id": "test_1.fq.gz",
-  "sample_id": "test_1.fq.gz"
+  "sample_id": "test_1",
+  "disk_size": 200
 }
 ```

samples.json

         "oss://choppy-app-example-data/RNAseq/test_fq/test_R1.fq.gz"
     ],
     "sample_name": "test_1.fq.gz",
-    "sample_id": "test_1"
+    "sample_id": "test_1",
+    "disk_size" : 200
 }