chore: add SoftMaskForUGUI package

Assets/Imported Assets/SharedModels.meta

@@ -1,8 +0,0 @@
-fileFormatVersion: 2
-guid: 984add6c67feea0f88fff3bb77af06cf
-folderAsset: yes
-DefaultImporter:
-  externalObjects: {}
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: 

Packages/manifest.json

@@ -1,5 +1,6 @@
 {
   "dependencies": {
+    "com.coffee.softmask-for-ugui": "https://github.com/mob-sakai/SoftMaskForUGUI.git",
     "com.unity.2d.animation": "5.1.0",
     "com.unity.2d.psdimporter": "4.2.0",
     "com.unity.2d.sprite": "1.0.0",

Packages/packages-lock.json

@@ -1,5 +1,12 @@
 {
   "dependencies": {
+    "com.coffee.softmask-for-ugui": {
+      "version": "https://github.com/mob-sakai/SoftMaskForUGUI.git",
+      "depth": 0,
+      "source": "git",
+      "dependencies": {},
+      "hash": "b870d64b5704a764fd03aaccb11f2dbe652b1756"
+    },
     "com.unity.2d.animation": {
       "version": "5.1.0",
       "depth": 0,