New bugfix and additional necessities for Exercise: 01-greet-people

[BarzinDevelops]

Changed the function so it does return an array of each name prefixed with 'Hello' ->
like this: ['Hallo name1', 'Hello name2', etc..]

Before this change the function returned: ['hello name1name2name3] which wasn't the desired result to expect.

The MISSING necessities of each Assignment/Exercise:

• 1. Each assignment/exercise should have a description file so developers know what is expected.
• 2. Also alway add a solution so codes can be compared.

For this exercise (greet-people) i created those files as example.

• Added description for greet-people.
• Added solution file for greet-people.

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View rendered II.write-tests/01-greet-people/Exercise_Description.md