Added gist solution file with 2 gist links

rhvsingh · rhvsingh · commit e547c37f9a26 · 2022-09-20T02:33:10.000+05:30
Signed-off-by: Raja Harsh Vardhan Singh &lt;singhrajaharshvardhan004@gmail.com&gt;
diff --git a/contributors/rhvsingh/gist-solutions.md b/contributors/rhvsingh/gist-solutions.md
@@ -0,0 +1,4 @@
+# Challenge 18:
+
+1. [ReactJS: A JS library](https://gist.github.com/rhvsingh/3a49a2ce551376ee397cf768f2c80aea)
+2. [Text in center of screen, HTML](https://gist.github.com/rhvsingh/0a1a9b519a63cf4cbab2bcb7cdc7f4fd)
