Add Compiler required interfaces

Author: austinv900

src/CompilerServices/ICompilation.cs

@@ -0,0 +1,7 @@
+namespace Oxide.CompilerServices
+{
+    public interface ICompilation
+    {
+        
+    }
+}

src/CompilerServices/ICompilerService.cs

@@ -0,0 +1,10 @@
+using System;
+using Oxide.Converters;
+
+namespace Oxide.CompilerServices
+{
+    public interface ICompilerService<T> : IDisposable
+    {
+        IConverter<ICompilation, T> Converter { get; }
+    }
+}

src/Converters/IConverter.cs

@@ -0,0 +1,7 @@
+namespace Oxide.Converters
+{
+    public interface IConverter<T, T0>
+    {
+        T0 Convert(T input);
+    }
+}

src/EnvironmentHelper.cs

@@ -2,10 +2,25 @@
 
 namespace Oxide
 {
+    /// <summary>
+    /// Helper methods for interacting with OxideMod specific environmental variables
+    /// </summary>
     public static class EnvironmentHelper
     {
+        /// <summary>
+        /// Gets a OxideMod environmental variable
+        /// </summary>
+        /// <param name="key">The environmental variable</param>
+        /// <returns></returns>
         public static string GetVariable(string key) => Environment.GetEnvironmentVariable(NormalizeKey(key));
 
+        /// <summary>
+        /// Sets a OxideMod environmental variable for the process
+        /// </summary>
+        /// <param name="key"></param>
+        /// <param name="value"></param>
+        /// <param name="force"></param>
+        /// <exception cref="InvalidOperationException"></exception>
         public static void SetVariable(string key, string value, bool force = false)
         {
             key = NormalizeKey(key);