Issue 24: Added read-only mode (#27)

- Added settings to workspace, and added the read-only mode
- Added the `-ro` field which will launch Dynamo-Browse in read-only mode
- Added the `set ro` to enable read-only mode, and `set rw` to enable read-write mode

test/cmd/load-test-table/main.go

@@ -49,7 +49,7 @@ func main() {
 	}
 
 	dynamoProvider := dynamo.NewProvider(dynamoClient)
-	tableService := tables.NewService(dynamoProvider)
+	tableService := tables.NewService(dynamoProvider, notROService{})
 
 	_, _ = tableService, tableInfo
 
@@ -103,3 +103,9 @@ func createTable(ctx context.Context, dynamoClient *dynamodb.Client, tableName s
 	}
 	return nil
 }
+
+type notROService struct{}
+
+func (n notROService) IsReadOnly() (bool, error) {
+	return false, nil
+}