modify variable name of $pe to `PE\Manager` class object is $analyze
The getElfHeader by class member method name is supporting to return value about `ELF Header` of `ELF file format`.

add ElfHeader structure
add Elf\Manager class
add Example\ELF
add Exemple elf program
append file about ELF and Manager class, ElfSectionHeader structure

add ELF example
add ELF SectionHeader
add ELF Manager