readelf: add page

pages/linux/readelf.md

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+# readelf
+
+> Displays information about ELF files.
+> More information: <http://man7.org/linux/man-pages/man1/readelf.1.html>.
+
+- Display all information about the ELF file:
+
+`readelf -all {{path/to/binary}}`
+
+- Display all the headers present in the ELF file:
+
+`readelf --headers {{path/to/binary}}`
+
+- Display the entries in symbol table section of the ELF file, if it has one:
+
+`readelf --symbols {{path/to/binary}}`
+
+- Display the information contained in the ELF header at the start of the file:
+
+`readelf --file-header {{path/to/binary}}`