docs: add welcome hello world file

HELLOWORLD.md

@@ -1,7 +1,11 @@
-Hello and welcome to the Trips project!
+Hello and welcome to the trips project!
 
-We're glad you're here. This repository is the home for the Trips application and the tools that support it.
+We are glad you are here. This repository exists to help you build and
+improve travel experiences, and your contributions make it better for
+everyone.
 
-If you're new, start with `README.md` to get the project running, then take a look around `src/` to see how things are organized.
+If you are new, start by reading the README and checking the scripts and
+configuration files to understand how the project is set up. Then pick an
+issue or improvement you are interested in and dive in.
 
-Happy building!
+Thanks for being part of the team and happy coding!