add poster instructions

poster.md

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+--- 
+title: Poster Instructions
+layout: default 
+weight: 7 
+hide: false
+---
+
+
+
+## Poster Instructions
+
+**Poster size.** Authors traveling to the conference should arrange to have their posters printed. The poster boards that will be used at the venue have size 190cm x 90cm (height x width). You can use any poster size as long as it fits on the board. We suggest portrait A0 (118.9 x 84.1 cm) or landscape A1 (59.4 x 84.1 cm).
+
+**Poster printing service (optional).** The AISTATS conference will be unable to provide  poster printing service on-site this year. Please see [this link](https://virtual.aistats.org/FAQ/PostersInstructions) for a recommended local print shop.
+
+**Poster upload (optional).** While AISTATS is primarily an in-person conference this year, we encourage authors to make their posters available online. [To upload your poster, click here](https://virtual.aistats.org/PosterUpload). Any poster template is allowed. Posters must be uploaded as a PNG format that cannot exceed 5120 x 2880 pixels (width x height) and cannot take more than 10 MB. Besides the poster, you may upload a thumbnail of a visually appealing figure that summarizes your paper (a PNG file of no more than 320 x 256 pixels and no more than 5 MB).
+- <u>Deadline</u>: April 26th 23:59 AoE.