Markdown automatic add serial number.
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Automatically read clipborad content.
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Write to clipboard after add serial number.
# title
## heading2-1
### heading3-1
### heading3-2
## heading2-2
## heading2-3
# title
## 1. heading2-1
### 1.1. heading3-1
### 1.2. heading3-2
## 2. heading2-2
## 3. heading2-3