Open readme and files on boot in gitpod

[leighmcculloch]

What

Open readme and files on boot in gitpod

Why

@rice2000 pointed out that it isn't very intuitive where to go. The readme has a link to the examples tutorials.

Gitpod

A prebuild of this PR on gitpod can be triggered with:

• https://gitpod.io/#prebuild/https://github.com/stellar/soroban-examples/pull/158

Open a gitpod running this PR:

• https://gitpod.io/#https://github.com/stellar/soroban-examples/pull/158

[leighmcculloch]