add "prompt-basics" language extension

extensions/prompt-basics/syntaxes/prompt.tmLanguage.json

@@ -0,0 +1,15 @@
+{
+	"information_for_contributors": [
+		"This file has been converted from https://github.com/microsoft/vscode-markdown-tm-grammar/blob/master/syntaxes/markdown.tmLanguage",
+		"If you want to provide a fix or improvement, please create a pull request against the original repository.",
+		"Once accepted there, we are happy to receive an update request."
+	],
+	"version": "0.1.0",
+	"name": "Prompt",
+	"scopeName": "text.html.markdown.prompt",
+	"patterns": [
+		{
+			"include": "text.html.markdown"
+		}
+	]
+}