Add 'Interoperable' section to 'Features' on front page (#608)

Author: LiamPattinson

source/index.md

@@ -46,6 +46,12 @@ Natively parallel
 
 Fortran is a natively parallel programming language with intuitive array-like syntax to communicate data between CPUs. You can run almost the same code on a single CPU, on a shared-memory multicore system, or on a distributed-memory HPC or cloud-based system. Coarrays, teams, events, and collective subroutines allow you to express different parallel programming patterns that best fit your problem at hand.
 
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+Interoperable
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+Fortran's standardized C interoperability enables seamless integration into multi-language projects, enabling the optimization of performance-critical components.
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 FAQ
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