This is a simple plugin which surrounds all selected text pieces by a given HTML tag.
If you haven't installed Package Control yet, visit Official installation guide.
Once Package Control is installed, you have to press Ctrl+shift+p and select the Package Control: Install Package option.
A list of plugins will show up. Type Surround and select it from the list. It will automatically install and keep updated. You are done!
Select some text (you can select more than one piece of text) and press Ctrl+Shift+M. Write in the prompt the desired tag WITHOUT < and >. You can even add some styling. Press Enter to surround the text with the given tag.
Given the selected text
Hi There
writing in the prompt
span style="color:blue"
will result in
<span style="color:blue">Hi There</span>