Interested in a girl at work but not sure how to proceed?

Hi. So I'm interested in this girl at work. I asked her one day where she got her coffee and she ended up bringing me a cup the next time she got some. We chat almost every day for a little. Didn't really know what to talk about, so I made her a playlist of some of my favorite music and she gave me her number to send it to her. Since then she always smiles and waves when she walks by (~3-5 times a day) and we talk getting more personal here and there. I want to text her so badly but afraid of coming off too strong and it's not the right move. She works in a different department and we sit on complete other sides of the office. Not sure if she's being nice or if she's actually kinda into me.

Interested in a girl at work but not sure how to proceed?
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