Add Syntax highlighting to code in Docs (#104)

docs/Microsoft.Omex.Gating/GatingTutorial.md

@@ -17,14 +17,16 @@ Usually it will look like this:
 
 _From the [Gating.Example](https://github.com/microsoft/Omex/tree/master/src/Gating.Example):_
 
-    Gates gates = new Gates(GateDataSetLoader);
+```cs
+Gates gates = new Gates(GateDataSetLoader);
 
-    IGatedRequest gatedRequest = new SampleGatedRequest();
-    IGateContext gateContext = new GateContext(gatedRequest, machineInformation, null);
-    gateContext.PerformAction(
+IGatedRequest gatedRequest = new SampleGatedRequest();
+IGateContext gateContext = new GateContext(gatedRequest, machineInformation, null);
+gateContext.PerformAction(
     new GatedAction(
         gates.GetGate("sample_allowed_gate"),
         () => Console.WriteLine("SampleAction has been called")));
+```
 
 ## Usage scenarios
 
@@ -36,8 +38,9 @@ Then you can use `GateExtensions.PerformAction(gate, Action)` on the context lik
 `PerformAction` will perform at most one action - the first one whose gate is applicable.
 By adding a `GatedAction` without a gate, you create a _default_ action, like an Else branch.
 
-    public class PointsAdder
-    {
+```cs
+public class PointsAdder
+{
     private readonly IGateContext m_gateContext;
     private readonly User m_user;
 
@@ -63,12 +66,14 @@ By adding a `GatedAction` without a gate, you create a _default_ action, like an
             )
         );
     }
-    }
+}
+```
 
 Another approach is to use the `PerformEachAction` method which will invoke code for every applicable `GateAction`, not just the first.
 
-    public List<Item> GetItems()
-    {
+```cs
+public List<Item> GetItems()
+{
     var items = new List<Item>();
     m_gateContext.PerformEachAction(
         new GatedAction(
@@ -79,7 +84,8 @@ Another approach is to use the `PerformEachAction` method which will invoke code
             () => AddGeneralItems(items)
         )
     );
-    }
+}
+```
 
 Very similar will be the use of `PerformFunction` and `GatedFunc`, but with a return value.