Update README.md

[jupiy]

• The capitalization rule is not consistent among the sub-headings
• Names are not consistent, e.g., file name & filename, file size & filesize, vdh & VDH
• Typo: "infomation" -> "information"
• Some article issues: missing "a" or "the"
• Some inappropriate abbreviation: "buff" -> "buffer", "point" -> "pointer"
• The nested numbered list is not correctly displayed
• Minor punctuation issues

Fix #3

[Travelinglight]

Please resolve conflicts