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phonebook.md

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+# phonebook
+
+Your task is to write a phonebook application where users can either query for names or phone numbers.
+
+The phonebook consists of the following entries:
+
+- Alice, 0255334232
+- Bob, 0434235235
+- Franz, 095487963
+- Else, 024654968
+
+Every entry has a `name` and a `number`.
+
+The user is able to pass the name or phone number they're looking for via the command line:
+
+Look up the entry by its number:
+```bash
+$ ruby phonebook.rb 024654968
+=> Else
+```
+
+Look up the entry by its name:
+```bash
+$ ruby phonebook.rb Else
+=> 024654968
+```
+
+If the phonebook does not contain the requested entry, the following should happen:
+
+```bash
+$ ruby phonebook.rb Notthere
+=> No entry 'Notthere' found
+```