Add read mode tips

at
yiliaofan · Oct 25, 2019 · 2284149 · 2284149
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commit 2284149
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/help.md b/help.md
@@ -334,3 +334,4 @@
 | -------               | -----                             |
 | `vim -u NONE -N`      | 开启vim时不加载vimrc文件          |
 | `vimdiff file1 file2` | 显示文件差异                      |
+| `vim -R filename`     | 以只读方式打开（阅读模式）          |