standardized cli arguments and expanded the README per the suggestions on the PR

Author: Kopas

README.md

@@ -25,13 +25,7 @@ By default, the CodeBuild project will not run within a VPC, the image will be p
 These can be overridden with the relevant CLI options.
 
 ```bash
-sm-docker build . --repository mynewrepo:1.0 --role MyRoleName --bucket MyBucketName --vpc-id MyVpcId --subnets MySubnetId1,MySubnetId2 --security-groups MySecurityGroup1,MySecurityGroup2
-``` 
-
-For instance, please see the sample command with additional argument listed below:
-
-```bash
-sm-docker build . --repository mynewrepo:1.0 --role SampleDockerBuildRole --bucket sagemaker-us-east-1-326543455535 --vpc-id vpc-0c70e76ef1c603b94 --subnets subnet-0d984f080338960bb,subnet-0ac3e96808c8092f2 --security-groups sg-0d31b4042f2902cd0
+sm-docker build . --repository mynewrepo:1.0 --role SampleDockerBuildRole --bucket sagemaker-us-east-1-326543455535 --vpc-id vpc-0c70e76ef1c603b94 --subnet-ids subnet-0d984f080338960bb,subnet-0ac3e96808c8092f2 --security-group-ids sg-0d31b4042f2902cd0
 ``` 
 
 The CLI will take care of packaging the current directory and uploading to S3, creating a CodeBuild project, starting a build with the S3 artifacts, tailing the build logs, and uploading the built image to ECR.

sagemaker_studio_image_build/cli.py

@@ -15,8 +15,8 @@ def validate_args(args, extra_args):
                 f'Error parsing reference: "{args.repository}" is not a valid repository/tag'
             )
 
-    vpc_config = [args.vpc_id, args.subnets, args.security_groups]
-    none_arg_count = sum(arg is None for arg in [args.vpc_id, args.subnets, args.security_groups])
+    vpc_config = [args.vpc_id, args.subnet_ids, args.security_group_ids]
+    none_arg_count = sum(arg is None for arg in [args.vpc_id, args.subnet_ids, args.security_group_ids])
 
     if none_arg_count > 0 and none_arg_count < 3:
         raise ValueError(
@@ -61,8 +61,8 @@ def construct_vpc_config(args):
     else:
         vpc_config = {
                         'vpcId': args.vpc_id,
-                        'subnets': args.subnets.split(','),
-                        'securityGroupIds': args.security_groups.split(',')
+                        'subnets': args.subnet_ids.split(','),
+                        'securityGroupIds': args.security_group_ids.split(',')
                         }
         return vpc_config
 
@@ -112,11 +112,11 @@ def main():
         help="The Id of the VPC that will host the CodeBuild Project (such as vpc-05c09f91d48831c8c).",
     )
     build_parser.add_argument(
-        "--subnets",
+        "--subnet-ids",
         help="The comma-separated list of subnet ids for the CodeBuild Project (such as subnet-0b31f1863e9d31a67)",
     )
     build_parser.add_argument(
-        "--security-groups",
+        "--security-group-ids",
         help="The comma-separated list of security group ids for the CodeBuild Project (such as sg-0ce4ec0d0414d2ddc).",
     )
     build_parser.add_argument(