Update README.md with Copyright text for LF projects (#484)

Update README.md with Copyright text for LF projects

Signed-off-by: Benazir Khan <benazirkhan@microsoft.com>

Author: benazirk

README.md

@@ -255,6 +255,7 @@ Hyperlight.
 
 > Note: For general Hyperlight development, you may also need flatc (Flatbuffer compiler): for instructions,
 > see [here](https://github.com/google/flatbuffers).
+> Copyright © contributors to Hyperlight, established as Hyperlight a Series of LF Projects, LLC.
 
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