Added idea and concept md files

docs/concept.md

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+# Concept
+
+- Homescreen
+  The homescreen of the App should display a list of upcoming tournaments
+  and a button to a tournament you are participating in.
+  If you press on a tournament in the list, the detail view should open
+- Tournament Detail View
+  The tournament detail view displays all the information about a tournament,
+  like
+- The registration period
+- The maximum amount of teams
+- Preview pictures
+- A button for registering your Team if in the registration period
+- A button to view the stats of the tournament if it has been completed or is currently ongoing

docs/idea.md

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+# Splatoon Tournament Manager
+
+## Explanation
+
+I implemented a tournament manager for Splatoon in the past, but it was for one client only, so the participating teams couldn't see their score.
+This new version is written in Flutter for Android and uses websockets to display your current ranking and information about the past matches during the tournament.
+The Backend is written in Express/JS and communicates with the frontend using both REST endpoints and Websockets while using an SQLite database for persistance.
+
+## Technologies
+
+- Flutter
+- Websockets
+- Express
+- SQLite