Read-write premium caching now in public preview

Read-write premium caching is now available for Azure HPC Cache. Read-write premium caching (also known as premium SKU), provides: * Lower latency * Increased disk throughput * Increased network bandwidth [Learn more](https://aka.ms/premium-hpc-cache). * Azure HPC Cache * Pricing & Offerings * [ Azure HPC Cache](https://azure.microsoft.com/en-gb/products/hpc-cache/)