docs: Added documnetation for SyncedVar

Author: TwoTenPvP

docs/_data/docs.yml

@@ -13,6 +13,7 @@
   - object-behaviour-relation
   - modularity
   - networkedvar
+  - syncedvar
   - scene-management
   - object-ownership
   - object-visibility

docs/_docs/the-basics/syncedvar.md

@@ -0,0 +1,23 @@
+---
+title: SyncedVar
+permalink: /wiki/syncedvar/
+---
+
+SyncedVars are simple ways to have syncronized fields in NetworkedBehaviours. SyncedVars are similar to NetworkedVars but have a few differences:
+
+1. They are slower
+2. They are less customizable
+3. They only sync from server to client
+4. They require less code
+5. They support serialization
+
+### Example
+Creating a SyncedVar is as easy as creating an attribute on the field. Note that properties are not supported.
+
+```csharp
+[SyncedVar]
+public float mySyncedFloat = 5f;
+```
+
+### Single Sync Values
+If you want values to be synced only once (at spawn), the send rate can be set to a negative value.