Added announcement on hardware migration

Author: Aryagm

README.md

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 # CodeGenX
 
+**Important Announcement**: We are currently in the process of migrating CodeGenX to more powerful hardware. This will improve inference time and make the service a lot faster. **CodeGenX will be temporarily inactive from the 28th of March 2022 for about one week.** The code generation will not work and new users won't be able to sign up during this period. The new hardware will also allow us to start working on a new and improved version of CodeGenX with more accurate generation capabilities! We apologize for the inconvenience.
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