Merge pull request #4 from RafaelGrochoska/feature/UPM

Add Unity Package Manager support

Editor/XNode.Groups.Editor.asmdef

@@ -0,0 +1,20 @@
+{
+    "name": "XNode.Groups.Editor",
+    "rootNamespace": "",
+    "references": [
+        "XNode",
+        "XNodeEditor",
+        "XNode.Groups"
+    ],
+    "includePlatforms": [
+        "Editor"
+    ],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": false,
+    "precompiledReferences": [],
+    "autoReferenced": true,
+    "defineConstraints": [],
+    "versionDefines": [],
+    "noEngineReferences": false
+}

Editor/XNode.Groups.Editor.asmdef.meta

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+fileFormatVersion: 2
+guid: fb02b04b80650c146891828c7bc58418
+AssemblyDefinitionImporter:
+  externalObjects: {}
+  userData: 
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README.md

@@ -3,4 +3,25 @@ A small addon for xNode that lets you add groups to your graphs
 
 ![2020-04-18_02-48-15](https://user-images.githubusercontent.com/6402525/79623974-269cc900-811f-11ea-9c3f-1f83105379ac.gif)
 
+### Installation
+<details><summary>Instructions</summary>
+
+### Installing with Unity Package Manager
+***Via Git URL***
+*(Requires Unity version 2018.3.0b7  or above)*
+
+To install this project as a [Git dependency](https://docs.unity3d.com/Manual/upm-git.html) using the Unity Package Manager,
+add the following line to your project's `manifest.json`:
+
+```
+"com.github.siccity.xnodegroups": "https://github.com/Siccity/xNodeGroups.git"
+```
+
+You will need to have Git installed and available in your system's PATH.
+
+### Installing 'the old way'
+If no source control or package manager is available to you, you can simply copy/paste the source files into your assets folder.
+
+</details>
+
 Requires [xNode](https://github.com/Siccity/xNode)

Runtime.meta

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+folderAsset: yes
+DefaultImporter:
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+  userData: 
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Runtime/XNode.Groups.asmdef

@@ -0,0 +1,16 @@
+{
+    "name": "XNode.Groups",
+    "rootNamespace": "",
+    "references": [
+        "XNode"
+    ],
+    "includePlatforms": [],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": false,
+    "precompiledReferences": [],
+    "autoReferenced": true,
+    "defineConstraints": [],
+    "versionDefines": [],
+    "noEngineReferences": false
+}

Runtime/XNode.Groups.asmdef.meta

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+guid: 0639f827a36f385439474b832a4a5044
+AssemblyDefinitionImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

package.json

@@ -0,0 +1,7 @@
+{
+    "name": "com.github.siccity.xnodegroups",
+    "description": "A small addon for xNode that lets you add groups to your graphs",
+    "version": "1.0.0",
+    "unity": "2018.1",
+    "displayName": "xNode Groups"
+}

package.json.meta

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