Add librusty

.gitignore

@@ -1 +1,2 @@
-ios/
+/ios/
+.DS_Store

librusty/rust-toolchain

@@ -0,0 +1 @@
+nightly-2019-09-13

unity/Assets/Plugins/iOS/librusty.a.meta

@@ -0,0 +1,33 @@
+fileFormatVersion: 2
+guid: de92a8c7a3f74cb49874894556c93027
+PluginImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  iconMap: {}
+  executionOrder: {}
+  defineConstraints: []
+  isPreloaded: 0
+  isOverridable: 0
+  isExplicitlyReferenced: 0
+  validateReferences: 1
+  platformData:
+  - first:
+      Any: 
+    second:
+      enabled: 0
+      settings: {}
+  - first:
+      Editor: Editor
+    second:
+      enabled: 0
+      settings:
+        DefaultValueInitialized: true
+  - first:
+      iPhone: iOS
+    second:
+      enabled: 1
+      settings:
+        AddToEmbeddedBinaries: false
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: