Update abstracts.md

Added link to the posters page

_coffinsincontext/abstracts.md

@@ -1,6 +1,6 @@
 ---
 category: coffinsincontext
-title: 'Programme and Abstracts'
+title: 'Programme, Posters and Abstracts'
 url: /coffinsincontext/abstracts
 image: /images/coffinsincontext/Pages.jpg
 order: 1
@@ -10,3 +10,5 @@ layout: coffins
 The final programme of the conference is [available here](../Final_programme.pdf).
 
 The final abstracts booklet is [available here](../Final_abstracts.pdf).
+
+The posters that were presented at the conference can be [viewed here](https://egyptiancoffins.org/CiCinfo/posters/).