GoUsers: add First Point (Turkey)

Add [First Point](https://firstpoint.com.tr) to the Turkey section of GoUsers.

First Point uses Go for backend microservices.

Change-Id: I35dacd0c714a410801ab2f86c04e2da957de0757
GitHub-Last-Rev: 9d3f6f770372a1f77dff9da3fb3d881b28be2ad2
GitHub-Pull-Request: golang/wiki#98
Reviewed-on: https://go-review.googlesource.com/c/wiki/+/782840
Reviewed-by: Sean Liao <sean@liao.dev>

GoUsers.md

diff --git a/GoUsers.md b/GoUsers.md
index 38b78b4..1506cb7 100644
--- a/GoUsers.md
+++ b/GoUsers.md
@@ -1412,6 +1412,7 @@
 ### Turkey
 
 - [Admongrel](http://www.admongrel.com/)
+- [First Point](https://firstpoint.com.tr) - Backend microservices
 - [Frigbo](https://frigbo.com/)
 - [Hepiyo](https://hepiyo.com/)
 - [icibot](https://icibot.com/)