Added simple power loss mechanic

Also added two UI texts to see power consumption and generation

Interfaces/IPowerSystem.cs

@@ -2,18 +2,59 @@ namespace GameDev.CoreSystems
 {
     public interface IPowerSystem
     {
+        /// <summary>
+        /// This entity generates power
+        /// </summary>
         public bool IsGenerator { get; }
 
+        /// <summary>
+        /// This entity consumes power
+        /// </summary>
         public bool IsConsumer { get; }
 
-        public void SetMaxPower(int newValue);
+        /// <summary>
+        /// True if consumer demand exceed generator capacity
+        /// </summary>
+        public bool PowerLost { get; set; }
 
+        /// <summary>
+        /// Initialize the power configuration of the entity with the <see cref="SoPowerConfig"/>
+        /// </summary>
+        /// <param name="config">Power config for the entity</param>
         public void Initialize(SoPowerConfig config);
 
+        /// <summary>
+        /// Max power for the entity
+        /// Generator capacity or max consumption depending on
+        /// the set type <see cref="IsGenerator"/> or <see cref="IsConsumer"/>
+        /// </summary>
+        /// <param name="newMaxPowerValue"></param>
+        public void SetMaxPower(int newMaxPowerValue);
+
+        /// <summary>
+        /// Current power for the entity
+        /// </summary>
+        /// <param name="newCurrentPowerValue">current power generated/consumed power for this entity [W]</param>
+        public void SetCurrentPower(int newCurrentPowerValue);
+
+        /// <summary>
+        /// Get Max power for the entity
+        /// Generator capacity or max consumption depending on
+        /// the set type <see cref="IsGenerator"/> or <see cref="IsConsumer"/>
+        /// </summary>
+        /// <returns>The max power that can be generated/consumed by this entity [W]</returns>
         public int GetMaxPower();
 
+        /// <summary>
+        /// Get current power for the entity.
+        /// </summary>
+        /// <returns>The power generated/consumed by this entity right now [W]</returns>
         public int GetCurrentPower();
 
+        /// <summary>
+        /// Get the power factor for the entity
+        /// </summary>
+        /// <returns>The ratio between current power and max power [factor]</returns>
         public float GetPowerFactor();
     }
 }