Set new information in package.json + Updated Readme for future releases

README.md

 
 * Install Unity 2018.3 or newer
 * Open your project's `Packages/manifest.json` file with a text editor
-* Add the following line to `dependencies` list :  `"com.unity.vfx-toolbox": "https://github.com/Unity-Technologies/VFXToolbox.git",`
+* Add the following line to `dependencies` list :  `"com.unity.vfx-toolbox": "https://github.com/Unity-Technologies/VFXToolbox.git#1.0.0-preview",`
 
 You should be good to go!
 

package.json

 {
-    "name":"com.unity.vfx-toolbox",
-    "displayName": "VFX Toolbox",
-    "version":"0.1.0",
-    "description":"Additional Tools for VFX Artists",
-    "keywords":[
-        "vfx",
-        "tools",
-        "flipbooks",
-        "visual",
-        "effects"
-    ]
-}
+  "name": "com.unity.vfx-toolbox",
+  "displayName": "VFX Toolbox",
+  "version": "1.0.0-preview",
+  "description": "Additional Tools for VFX Artists.\n\n* Image Sequencer\n* Houdini Exporters for Visual Effect Graph",
+  "keywords": [
+    "vfx",
+    "tools",
+    "flipbooks",
+    "visual",
+    "effects"
+  ],
+  "type": "tool",
+  "hideInEditor": false,
+  "unity": "2018.3"
+}

package.json.meta

 fileFormatVersion: 2
 guid: 947b0daafa45bff488f7befc4ff95f19
-TextScriptImporter:
+PackageManifestImporter:
   externalObjects: {}
   userData: 
   assetBundleName: