fix: Setting default value for params schema in resource app (#259)

Author: sp1goyal

cloudfoundry/provider/resource_app.go

@@ -22,6 +22,7 @@ import (
 	"github.com/hashicorp/terraform-plugin-framework/resource/schema"
 	"github.com/hashicorp/terraform-plugin-framework/resource/schema/planmodifier"
 	"github.com/hashicorp/terraform-plugin-framework/resource/schema/setplanmodifier"
+	"github.com/hashicorp/terraform-plugin-framework/resource/schema/stringdefault"
 	"github.com/hashicorp/terraform-plugin-framework/resource/schema/stringplanmodifier"
 	"github.com/hashicorp/terraform-plugin-framework/schema/validator"
 	"github.com/hashicorp/terraform-plugin-framework/tfsdk"
@@ -161,6 +162,7 @@ func (r *appResource) Schema(_ context.Context, _ resource.SchemaRequest, resp *
 							MarkdownDescription: "A json object to send to the service broker during service binding.",
 							Optional:            true,
 							Computed:            true,
+							Default:             stringdefault.StaticString("{}"),
 						},
 					},
 				},