add samples for charSequenceAssertions of api-fluent

[robstoll]

Code related feature

See for the initial request: #624

With this issue we want to add samples for charSequenceAssertions.kt of api-fluent

Following the things you need to do:

api-fluent

• create CharSequenceAssertionSamples in apis/fluent-en_GB/atrium-api-fluent-en_GB-common/src/test/kotlin/ch/tutteli/atrium/api/fluent/en_GB/samples
  • add one function per function in charSequenceAssertions.kt (see AnyAssertionSamples)
  • refer to the sample in the KDoc of the corresponding function in charSequenceAssertions via @sample (check out toBe in anyAssertions.kt to see how you have to refer to the sample)

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[jdornieden]

I'll work on this