Update .gitignore

Author: CompetitiveLin

.gitignore

@@ -4,6 +4,8 @@
 !.editorconfig
 !.nojekyll
 !.travis.yml
+!.vscode/
+!.placeholder
 
 # bundler cache
 _site

.vscode/markdown.code-snippets

@@ -0,0 +1,88 @@
+{
+	// Place your global snippets here. Each snippet is defined under a snippet name and has a scope, prefix, body and 
+	// description. Add comma separated ids of the languages where the snippet is applicable in the scope field. If scope 
+	// is left empty or omitted, the snippet gets applied to all languages. The prefix is what is 
+	// used to trigger the snippet and the body will be expanded and inserted. Possible variables are: 
+	// $1, $2 for tab stops, $0 for the final cursor position, and ${1:label}, ${2:another} for placeholders. 
+	// Placeholders with the same ids are connected.
+	// Example:
+	"Markdown snippet": {
+		"prefix": "md",
+		"body": [
+			"---",
+			"title: $1",
+			"categories: [$2]",
+		  	"tags: [$3]",
+			"date: ${CURRENT_YEAR}-${CURRENT_MONTH}-${CURRENT_DATE}T${CURRENT_HOUR}:${CURRENT_MINUTE}:${CURRENT_SECOND}+800",
+			//"image:",
+			//"  path: /images/header/$4",
+		 	"last_modified_at: ",
+			"pin: false",
+			"---",
+			"$0"
+		],
+		"description": "Markdown template for jekyll."
+	},
+
+	"Time snippet": {
+		"prefix": "time",
+		"body": [
+			"${CURRENT_YEAR}-${CURRENT_MONTH}-${CURRENT_DATE}T${CURRENT_HOUR}:${CURRENT_MINUTE}:${CURRENT_SECOND}+800",
+		],
+		"description": "For last modified time."
+	},
+
+	"Leetcode snippet": {
+		"prefix": "leetcode",
+		"body": [
+			"---",
+			"title: Leetcode-$1",
+			"categories: [Leetcode, $2]",
+		  	"tags: [leetcode, $3]",
+			"date: ${CURRENT_YEAR}-${CURRENT_MONTH}-${CURRENT_DATE}T${CURRENT_HOUR}:${CURRENT_MINUTE}:${CURRENT_SECOND}+800",
+		 	"last_modified_at: ",
+			"pin: false",
+			"---",
+			"",
+			"题目来源：[]()",
+			"",
+			"## Description",
+			"",
+			"",
+			"",
+			"",
+			"**示例1：**",
+			"",
+			"<pre>",
+			"<strong>输入：</strong>",
+			"<strong>输出：</strong>",
+			"<strong>解释：</strong>",
+			"</pre>",
+			"",
+			"**示例2：**",
+			"",
+			"<pre>",
+			"<strong>输入：</strong>",
+			"<strong>输出：</strong>",
+			"<strong>解释：</strong>",
+			"</pre>",
+			"",
+			"**提示：**",
+			"",
+			"- ",
+			"",
+			"",
+			"## Solution",
+			"",
+			"",
+			"",
+			"",
+			"## Code",
+			"```java",
+			"",
+			"```",
+			"$0"
+		],
+		"description": "For leetcode."
+	}
+}