docs: Add Bottlerocket example (#1296)

Signed-off-by: Andrey Devyatkin <andrey.devyatkin@fivexl.io>

examples/bottlerocket/variables.tf

@@ -0,0 +1,17 @@
+variable "k8s_version" {
+  description = "k8s cluster version"
+  default     = "1.20"
+  type        = string
+}
+
+variable "enable_admin_container" {
+  description = "Enable/disable admin container"
+  default     = false
+  type        = bool
+}
+
+variable "enable_control_container" {
+  description = "Enable/disable control container"
+  default     = true
+  type        = bool
+}