Add TFLint configuration with Terraform best practices

- Enabled Terraform recommended preset
- Added rules for documentation, naming conventions, and unused declarations
- Note: No TFLint plugins available for vsphere or vault providers
- Core Terraform ruleset will still catch syntax errors and best practices

.tflint.hcl

@@ -0,0 +1,37 @@
+plugin "terraform" {
+  enabled = true
+  preset  = "recommended"
+}
+
+# Additional Terraform best practice rules
+rule "terraform_deprecated_interpolation" {
+  enabled = true
+}
+
+rule "terraform_documented_outputs" {
+  enabled = true
+}
+
+rule "terraform_documented_variables" {
+  enabled = true
+}
+
+rule "terraform_naming_convention" {
+  enabled = true
+}
+
+rule "terraform_required_version" {
+  enabled = true
+}
+
+rule "terraform_required_providers" {
+  enabled = true
+}
+
+rule "terraform_unused_declarations" {
+  enabled = true
+}
+
+rule "terraform_standard_module_structure" {
+  enabled = true
+}