Add section about Dependency Installation to README.md
Add section about Dependency Installation to README.md

melya/phpseclib,terrafrost/phpseclib,danog/phpseclib,metaclassing/phpseclib,phpseclib/phpseclib,splitice/phpseclib,creatuity/phpseclib,paragonie-scott/phpseclib,creatuity/phpseclib,kenichiii/phpseclib,thaigialai1987/phpseclib,splitice/phpseclib,metaclassing/phpseclib,danog/phpseclib,thaigialai1987/phpseclib,melya/phpseclib,kenichiii/phpseclib,paragonie-scott/phpseclib