Bodies and textures positions are fixed, added field boundaries

core/src/com/mygdx/game/GameScreens/GamePlay.java

core/src/com/mygdx/game/GameScreens/GameScreen.java

core/src/com/mygdx/game/bodies/Ball.java

core/src/com/mygdx/game/bodies/FieldBounds.java

core/src/com/mygdx/game/bodies/Goal.java

core/src/com/mygdx/game/bodies/Player.java

core/src/com/mygdx/game/bodies/TextureBody.java