Add README documentation for "spellCheckDelayMs" setting
Add README documentation for "spellCheckDelayMs" setting

Updated the README file to include documentation for the new "cSpell.spellCheckDelayMs" configuration setting, including it's default value.
Jason-Rev/vscode-spell-checker,Jason-Rev/vscode-spell-checker,Jason-Rev/vscode-spell-checker,Jason-Rev/vscode-spell-checker,Jason-Rev/vscode-spell-checker