Add README, screenshots and wiki in English, Danish and Bahasa Malaysia

Task: MIL-003#1 Task: MIL-003#2 Refs #14 Refs #15 Refs #16 Refs #17 Refs #18
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+# Usage
+
+🌐 **English** · [Dansk](Usage-da) · [Bahasa Melayu](Usage-ms)
+
+Activate the virtual environment (see [Install](Install)), then start the program:
+
+```bash
+python -m nato_alphabet
+```
+
+The installed command does the same:
+
+```bash
+nato-alphabet
+```
+
+## Spell a word
+
+The program asks for a word and prints the NATO code word of each letter, in order. Upper and lower case give the same result.
+
+![The tool spelling the word Hello](images/spell-word.png)
+
+## Invalid input
+
+A digit, a space or a punctuation mark is not a letter. The program says so and asks again.
+
+![A word with a digit is rejected, then a valid word is spelled](images/retry-invalid.png)
+
+## Press Ctrl+C or Ctrl+D
+
+Ending the input (Ctrl+D on Linux and macOS, Ctrl+Z then Enter on Windows) or pressing Ctrl+C closes the program quietly.