Added scriptable vars shared code and removed meta-less readme.

Scriptable Variables/Variables/Reference Types/ReferenceScriptableVariable.cs

+using UnityEngine;
+
+namespace Shared.ScriptableVariables {
+  // A reference to a boolean value to share across components, scenes, and prefabs that can be overridden to a constant different value
+  public class ReferenceScriptableVariable<TScriptableVariable, TValueType> : ScriptableVariable where TScriptableVariable : ScriptableVariable<TValueType> {
+    [Tooltip("Whether to use the referenced value or a constant value")]
+    public bool useConstant;
+
+    [Tooltip("An override constant value to use instead of the reference value")]
+    public TValueType constantValue;
+
+    [Tooltip("The variable this component is referencing")]
+    public TScriptableVariable referenceValue;
+
+    public TValueType Value { get { return useConstant ? constantValue : referenceValue.Value; } set { referenceValue.Value = value; } }
+  }
+}

Scriptable Variables/Variables/Reference Types/ReferenceScriptableVariable.cs.meta

+fileFormatVersion: 2
+guid: 036ed80159a9c6340a57b5ab8830d4b6
+timeCreated: 1510599427
+licenseType: Pro
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Scriptable Variables/Variables/Reference Types/ReferenceStringVariable.cs

+using UnityEngine;
+
+namespace Shared.ScriptableVariables {
+  // A reference to a string value to share across components, scenes, and prefabs that can be overridden to a constant different value
+  [CreateAssetMenu(menuName = "Scriptable Objects/Variables/Reference/String")]
+  public class ReferenceStringVariable : ReferenceScriptableVariable<StringVariable, string> {
+  }
+}

Scriptable Variables/Variables/Reference Types/ReferenceStringVariable.cs.meta

+fileFormatVersion: 2
+guid: 37c1a078c5908a54d9b514dcd4c35db1
+timeCreated: 1510599427
+licenseType: Pro
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: