Edited installing swift index (#649)

* Added user-friendly language and simple steps for clarity.

* Update install/index.md

Co-authored-by: Tim Condon <[email protected]>

* Update install/index.md

Co-authored-by: Tim Condon <[email protected]>

* Minor tweaks to wording in steps 1 and 2

1. Simplified language at the end of step 1. 
2. Added clarifying wording to run the "command" in step 2.

---------

Co-authored-by: Tim Condon <[email protected]>

Author: RobinBateman808

install/index.md

@@ -3,9 +3,14 @@ layout: page
 title: Install Swift
 ---
 
-Follow the instructions below to install the latest version of Swift on a [supported platform](/platform-support).
+Whether you are a beginner or an experienced programmer, learning and using Swift can open up opportunities for you to build innovative applications for Apple devices and applications beyond Apple's ecosystem. Not only can you use Swift on macOS, but using Swift on Linux and Windows makes Swift a valuable language for developers looking to work across different platforms and environments. 
 
-You can also [download nightly snapshots and older releases](/download).
+Follow these general steps to start using Swift:
+
+1. Choose your development platform below and follow the instructions to install the latest version of Swift. See the [supported platforms page](/platform-support) for the Swift-supported platforms.
+2. After the installation is complete, you can verify the installation by running the `swift —version` command.
+
+> Tip: You can also [download nightly snapshots and older releases](/download).
 
 ### Latest Release: Swift {{ site.data.builds.swift_releases.last.name }}