Add first draft of the introduction lesson

[connoraird]

closes #10

[github-actions]

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Rendered Changes

🔍 Inspect the changes: https://github.com/UCL-ARC/fortran-unit-testing-lesson/compare/md-outputs..md-outputs-PR-2

The following changes were observed in the rendered markdown documents:

 introduction.md | 126 ++++++++++++++++++++++----------------------------------
 md5sum.txt      |   2 +-
 2 files changed, 51 insertions(+), 77 deletions(-)

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⏱️ Updated at 2025-07-03 15:54:34 +0000