Add section on JNI / FFI, Android 16KB memory alignment

[bclarke123]

Description

Hi, thanks for this fantastic project! I could only find a few code examples to explain how to call Rust directly from Swift / Kotlin, so I added a brief section to the mobile plugin development page. Also, I added an explanation on how to configure Android builds to be compatible with the new 16KB memory alignment requirements. All feedback welcome!

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