feat(markdown): add snippet for blog post title metadata

snippets/markdown.json

@@ -1,4 +1,23 @@
 {
+  "title for blog post":{
+    "prefix": "title",
+    "body": [
+      "---",
+      "title: ${1:Your Title}",
+      "date: \"${CURRENT_YEAR}-${CURRENT_MONTH}-${CURRENT_DATE} ${CURRENT_HOUR}:${CURRENT_MINUTE}:${CURRENT_SECOND}-0000\"",
+      "description: >-",
+      "  ${2:Your description here}",
+      "tags:",
+      "  - ${3:Tag1}",
+      "  - ${4:Tag2}",
+      "  - ${5:Tag3}",
+      "image: ./${6:cover.png}",
+      "---",
+      "",
+      "$0"
+    ],
+    "description": "Title for my blog post"
+  },
   "header 1": {
     "prefix": "h1",
     "body": ["# ${0}"],