Add Redis resources' examples

redis/README.md

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+# Redis Example
+
+This example shows how you can manage a Redis store/cache with Terraform using the `"gridscale_redis_store"` and `"gridscale_redis_cache"` resources.
+
+Before you run Terraform, you need to set the `GRIDSCALE_TOKEN` and `GRIDSCALE_UUID` environment variables to their appropriate values. Take a look at the `.envrc` file for all variables.
+
+## Example
+
+In this example we will provision 2 Redis resources:
+- The first one is a Redis store resource.
+- The second one is a Redis cache resource.

redis/redis.tf

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+terraform {
+  required_providers {
+    gridscale = {
+      source  = "gridscale/gridscale"
+      version = "~> 1.11.0"
+    }
+  }
+}
+
+resource "gridscale_redis_store" "terra-redis-store-test" {
+  name = "my redis store"
+  release = "5.0"
+  performance_class = "insane"
+}
+
+resource "gridscale_redis_cache" "terra-redis-cache-test" {
+  name = "my redis cache"
+  release = "5.0"
+  performance_class = "insane"
+}