add readme

readme.md

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+# jupyter notebook
+
+## 说明
+
+这是一个jupyter notebook的笔记备份目录。
+备份文件扩展名是.ipynb，可以参考以下方式预览
+
+## 预览ipynb
+[https://cloud.the8th.work:8443/demo/nbviewer/](https://cloud.the8th.work:8443/demo/nbviewer/)
+
+
+```javascript
+// 代码提交到git后产生一个raw 地址
+var url = "https://cloud.the8th.work:8580/akira/notebook/raw/branch/master/javascript.ipynb"
+var base64 = Buffer.from(url).toString("base64")
+var previewurl = `https://cloud.the8th.work:8443/demo/nbviewer/#${base64}`
+previewurl
+```
+
+
+
+
+    'https://cloud.the8th.work:8443/demo/nbviewer/#aHR0cHM6Ly9jbG91ZC50aGU4dGgud29yazo4NTgwL2FraXJhL25vdGVib29rL3Jhdy9icmFuY2gvbWFzdGVyL2phdmFzY3JpcHQuaXB5bmI='
+
+
+
+
+```javascript
+
+```
+
+[https://cloud.the8th.work:8443/demo/nbviewer/#aHR0cHM6Ly9jbG91ZC50aGU4dGgud29yazo4NTgwL2FraXJhL25vdGVib29rL3Jhdy9icmFuY2gvbWFzdGVyL2phdmFzY3JpcHQuaXB5bmI=](https://cloud.the8th.work:8443/demo/nbviewer/#aHR0cHM6Ly9jbG91ZC50aGU4dGgud29yazo4NTgwL2FraXJhL25vdGVib29rL3Jhdy9icmFuY2gvbWFzdGVyL2phdmFzY3JpcHQuaXB5bmI=)