make openssl key and cert code example

Example 1: generate key and certificate openssl

openssl req -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem -days 365

Example 2: openssl generate self signed certificate

openssl.exe genrsa -out <yourcertname>.key 4096

openssl.exe req -new -key yourcertname.key -out yourcertname.csr