add some friend links and README file

Author: RocketMaDev

README.md

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+# This is my blog!
+
+Visit it by clicking here: https://rocketmadev.github.io

source/_data/links.yml

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+- links_category: 校内
+  has_thumbnail: true
+  list: 
+  - name: JBNRZ
+    link: https://jbnrz.com.cn/
+    description: 头号摸鱼头子
+    avatar: /images/friends/jbnrz_avatar.jpg
+    thumbnail: /images/friends/jbnrz_banner.jpg
+
+- links_category: 校外
+  has_thumbnail: true
+  list:
+  - name: nova
+    link: https://n.ova.moe
+    description: 逆天二次元
+    avatar: /images/friends/nova_avatar.png
+    thumbnail: /images/friends/nova_banner.png
+