Docs/guide about debugging crashes for java developers

It's important to teach how java developers can debug crashes in swift.

E.g. a crash

     Stack: [0x000000016d7c8000,0x000000016d9cb000],  sp=0x000000016d9c5d10,  free space=2039k
     Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
     V  [libjvm.dylib+0x579b14]  jni_GetArrayLength+0x108
     C  [libSwiftJava.dylib+0x1a1dc4]  $sSa16SwiftJavaJNICoreAA0B5ValueRzlE7fromJNI2inSayxGSvSg_SpySPySo18JNINativeInterfaceVGSgGtcfC+0x118
     C  [libSwiftJava.dylib+0x1a4c24]  $sSayxG16SwiftJavaJNICore0B5ValueA2bCRzlAbCP7fromJNI2inx7JNITypeQz_SpySPySo18JNINativeInterfaceVGSgGtcfCTW+0x20
     C  [libSwiftJava.dylib+0x1a277c]  $sSa16SwiftJavaJNICoreAA0B5ValueRzlE7fromJNI2inSayxGSvSg_SpySPySo18JNINativeInterfaceVGSgGtcfcx7JNITypeQzXEfU2_+0xb8
     C  [libSwiftJava.dylib+0x1a27bc]  $sSa16SwiftJavaJNICoreAA0B5ValueRzlE7fromJNI2inSayxGSvSg_SpySPySo18JNINativeInterfaceVGSgGtcfcx7JNITypeQzXEfU2_TA+0x2c
     C  [libSwiftJava.dylib+0x1988]  $sSlsE3mapySayqd__Gqd__7ElementQzqd_0_YKXEqd_0_YKs5ErrorRd_0_r0_lF+0x400
     C  [libSwiftJava.dylib+0x1a2150]  $sSa16SwiftJavaJNICoreAA0B5ValueRzlE7fromJNI2inSayxGSvSg_SpySPySo18JNINativeInterfaceVGSgGtcfC+0x4a4
     C  [libMySwiftLibrary.dylib+0x36670]
     $s14MySwiftLibrary023Java_com_example_swift_abC29__00024nestedByteArray___3_3B11environment9thisClass5arraySvSgSpySPySo18JNINativeInterfaceVGSgGSg_SvAFtF+0xe8
     C  [libMySwiftLibrary.dylib+0x36580]  Java_com_example_swift_MySwiftLibrary__00024nestedByteArray___3_3B+0xc
     j  com.example.swift.MySwiftLibrary.$nestedByteArray([[B)[[B+0
     j  com.example.swift.MySwiftLibrary.nestedByteArray([[B)[[B+9
     j  com.example.swift.ArraysTest.lambda$nestedByteArray_null$1()V+24
     j  com.example.swift.ArraysTest$$Lambda+0x0000060001166dc0.execute()V+0
     j  org.junit.jupiter.api.AssertThrows.assertThrows(Ljava/lang/Class;Lorg/junit/jupiter/api/function/Executable;Ljava/lang/Object;)Ljava/lang/Throwable;+1
     j  org.junit.jupiter.api.AssertThrows.assertThrows(Ljava/lang/Class;Lorg/junit/jupiter/api/function/Executable;)Ljava/lang/Throwable;+3
     j  org.junit.jupiter.api.Assertions.assertThrows(Ljava/lang/Class;Lorg/junit/jupiter/api/function/Executable;)Ljava/lang/Throwable;+2
     j  com.example.swift.ArraysTest.nestedByteArray_null()V+18

can be demangled using cat ... | swift demangle but java developers may not know about this etc.

Start from the crash output in the issue and the mentioned swift demangle command; no documentation file or test is identified in the payload. The guide should explain how Java developers can investigate Swift crashes and demangle the native stack frames, using the provided example as the reference for completion.