Added "Word Guessing Game" idea

This word-guessing game is an intermediate project idea.

Projects/2-Intermediate/Word-Guessing-Game.md

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+# Word-Guessing Game
+
+**Tier:** 2-Intermediate
+
+A small word-guessing game also known as "Hangman". One player sets a word the other one has to guess.
+Every letter is one point, and after a set number of rounds, the points will be counted together,
+and the winner will be shown.
+
+The most difficult thing is the array handling because the entered word needs to be loaded in an array to replace
+duplicate characters: if the word is "Hello" and the player enters "L" both ls need to be replaced -> "_ _ L L _".
+
+Features:
+-   [ ] User can set the number of rounds.
+-   [ ] Output array with underscores.
+-   [ ] Solution array with the solution.
+-   [ ] Duplicate characters need to be replaced.
+
+## User Stories
+
+-   [ ] Player 1 can see an `input` text field to enter the word to be guessed.
+-   [ ] Player 2 can see a `Label` with underscores for each character in the solution.
+-   [ ] Player 2 can enter one character, and if this character is in the solution, it will be replaced automatically.
+-   [ ] Player switch (player 2 sets the question and player 1 tries to guess it).
+
+## Bonus features
+
+-   [ ] Player 2 can enter a String except for one single character.
+
+## Example projects
+
+If you want to see how a project like this could look, check [this project out](https://www.github.com/GregorGott/Word-Guesser).
+It's a JavaFX word-guessing game.