added first event functions documented server behaviour for some events

Game Server/server logic notes.md

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+# validation for placing cards:
+- is the game still running
+- is it the players turn
+- does the card exist
+- does the player have that card in his deck
+- does the player have this card in his hand
+- is the type of card allowed in that type of field
+- is the field already blocked by another card
+
+# validation for attacking another player
+- is the game still running
+- is it the players turn
+- does the card exist
+- does the player have that card in his deck
+- is that card played
+- does the enemy have remaining monster cards on his side
+    - if yes a direct attack would only be possible if a effect allows it
+- can this card attack
+    - is the card of correct type
+    - is it blocked by effects (will be implemented after card effects are implemented)
+
+# player death management (win condition)
+- does a players hp go to 0?
+    - make the other player the winner
+    - if an effect affects the playing player card priority comes first
+
+# handle a player leaving
+- check if game still runs
+    - make remaining player win if yes   
+
+# turn management
+- server keeps track of each turn
+    - whos turn is it
+    - what turn state is currently active
+        - draw state
+        - place state
+    - is the player trying to do actions not allowed in the given state