Updates survivor objectives

Adds some more depth to what survivors have to do to win the game, as it is dependent on the map, some commonly seen goals are added

README.md

@@ -2,7 +2,16 @@
 
 Custom Team Fortress 2 Gamemode, inspired by Left 4 Dead.
 
-There's 2 teams, Survivors (RED) and Zombies (BLU). The Survivors start with melee weapons and must survive for x amount of time while collecting weapons/ammo that are found around the map.
+There's 2 teams, Survivors (RED) and Zombies (BLU). The Survivors start with melee weapons and must complete objectives while collecting weapons/ammo that are found around the map.  
+The objectives are determined by the map, so there can be a large amount of variation in the goal for the survivors.  
+
+<ins>Some commonly seen objectives are as follows:</ins>
+* surviving for x amount of time
+* gathering items
+* traversing through the map to the end
+* defeating bosses
+* capturing control points
+
 
 The Zombie team starts off with a percent of the total amount of players, and must kill and infect all of the survivors before x amount of time runs out. To counteract the imbalance between melee-only and the ranged weapons that the survivors have, zombies can also "mutate" into special infected. On every kill, the zombie gains a special infected point, which is factored into spawning as a special infected after death.