add support to install this repo as a package

Assets/PathCreator/Core/package.json

@@ -0,0 +1,8 @@
+{
+  "name": "com.seblague.pathcreator",
+  "version": "1.0.0",
+  "displayName": "Path Creator",
+  "unity": "2018.1",
+  "dependencies": {
+  }
+}

README.md

@@ -1,9 +1,24 @@
 # Path-Creator
 
-[Watch overview video](https://www.youtube.com/watch?v=saAQNRSYU9k)
+## Installation
+Add the following path to dependencies in your manifest to install through [UPM](https://docs.unity3d.com/Packages/com.unity.package-manager-ui@1.8/manual/index.html)  
+```json
+"dependencies": {
+    "com.seblague.pathcreator": "https://github.com/hannesdelbeke/Path-Creator.git?path=/Assets/PathCreator/Core",  
+}
+```
 
-[Read the documentation](https://docs.google.com/document/d/1-FInNfD2GC-fVXO6KyeTSp9OSKst5AzLxDaBRb69b-Y/edit?usp=sharing)
+## Repo setup 
+To easily stay in sync with the original repo,  
+The package.json file is in a sub directory, in the core folder. Instead of at the repo root.  
+It includes only the essential files, and does not install the examples and documentation.pdf  
 
-[Download from asset store](https://assetstore.unity.com/packages/tools/utilities/b-zier-path-creator-136082)
+## Requirements
+You need a unity version that supports sub directories in the github repo path  
+Tested on Unity 2019.3.14f1.
 
+## Documentation    
+[Watch overview video](https://www.youtube.com/watch?v=saAQNRSYU9k)
+[Read the documentation](https://docs.google.com/document/d/1-FInNfD2GC-fVXO6KyeTSp9OSKst5AzLxDaBRb69b-Y/edit?usp=sharing)
+[Download from asset store](https://assetstore.unity.com/packages/tools/utilities/b-zier-path-creator-136082)
 ![Path Creator](https://i.imgur.com/xqTCNWK.png)