ReadMe add step go get ... see provided patch to fix it

[surfmuggle]

👓 What did you see?

For someone new to Go and godog the Readme could be improved by providing more hints / steps to do.
See surfmuggle-patch-1 to fix it.

File go.sum

• Expected File go.sum exists
• Actual go.sum does not exists

According to the README these files should be present

As far as i can tell i did every step of the readme. But the file sum.go is missing in my folder.

To my understanding sum.go is not created yet, because no building command (like go build, go test) has been run yet.

Running go test

• Expected: go test results in testing: warning: no tests to run PASS ok godogs
• Actual: go test results in a FAIL see below

C:\dev\golang\src\TestHello\godogs>go test
# godogs
godogs_test.go:3:8: no required module provides package github.com/cucumber/godog; to add it:
        go get github.com/cucumber/godog
FAIL    godogs [setup failed]

✅ What did you expect to see?

Add go get github.com/cucumber/godog above the phrase Our module should now look like this:.
See this godog-my-patch-1 to fix it.

📦 Which tool/library version are you using?

🔬 How could we reproduce it?

Steps to reproduce the behavior:

1. Install '...' version '...'
2. Create a file called '....'
3. Run command '....'
4. See error '....'

📚 Any additional context?

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