Update README.md

README.md

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-# Heroku × Flutter
-Compile and deploy your Flutter Web projects automatically on Heroku easily.
+# Heroku Buildpack for Flutter
+![header](https://user-images.githubusercontent.com/38699812/89092029-fb5b8400-d373-11ea-8ac0-6a46c817ae3b.png)
+Automate your deployments on Heroku easily.
 
 ## 🔨 Setup
-#### 1. Add this buildpack in your Heroku app.
+
+#### Add this Buildpack in your Heroku app 
+
    You can copy the [link](https://github.com/diezep/heroku-buildpack-flutter) of this repository and paste it in buildpacks or write **diezep/flutter** and will be added automatically.
-#### 2. Add PHP buildpack in your Heroku app.
-   Is necessary add PHP buildpack **after** this buildpack. 
-
-   PHP Buildpack is needed to run the static files in a web service that can be opened in browsers.
-   *You can skip this step if you have another way to deploy statics files, like NodeJS, Flask..*
 
-#### **IMPORTANT:** 
+#### Optional
+
+   You can add optional [environment variables](#--environment-variables) to customize the deployment of your project but nothing is required, all are optional.
+
+#### Problems to compile
   By default, this buildpack get the **last version** of Flutter automatically, sometimes because is on beta channel, that version may have problems to compile a project with web support. 
 
   If this is your case, you can try downgrade the Flutter version manually, add FLUTTER_VERSION variable in your Heroku environment with the number of the most recent version that are currently working correctly.
 
-**[UPDATED] Last working version:** 1.19.0-4.3.pre
+**Last working version :** 1.19.0-4.3.pre
+
+## 🚩 TODO :
+
+### Environment variables :
+
+* [x] VERSION to set the name of custom version of Flutter.
+* [x] CLEANUP to remove uneccessary files after the build.
+* [ ] CACHE to remove and download every file its need to compile the project in every deploy.
+* [ ] SUBDIR to ubicate the project if it isn't in a root directory.
+
+### Features :
+
+* [x] No more PHP Buildpack needed.
+* [x] Save and restore Flutter and Dart SDK in cache.
+* [x] Save and restore [dhttpd](https://github.com/diezep/dhttpd) in cache.
+* [ ] Save and restore project dependencies needed in cache.
+
+## 🚧 Environment variables:
+
+All variables were built following the structure **FLUTTER_VARNAME** to identified easily in Heroku configurations. If you want to use some variable, remember **use the structure** following to the variable.
+
+| Variable |   Type  |   Default        |  Description
+|----------|---------|------------------| -------------------|
+| CLEANUP  | *boolean* |  <center>true</center> |Remove **uneccessary files** of your project after the compile. |
+|  VERSION | <center>*string*</center> | *Last version in [beta channel](https://flutter.dev/docs/development/tools/sdk/releases?tab=linux).* | The **name of the version** you want to use to compile the project.| 
+
+### Set variable
+   Example of setting CLEANUP var in Heroku CLI:
+   ```shellscript
+   $ heroku config:set FLUTTER_CLEANUP=true -a project-name
+   ```
+### Example
+
+The next image is an example of setting environment variables following the structure mentioned above :
+
+![example_use_in_variables](https://user-images.githubusercontent.com/38699812/89090700-42447c00-d36a-11ea-8148-84af7cddfa21.PNG)
+
+<!-- TODO: ## 📌 LICENCE -->
+<!-- TODO: ## 📌 CONTRIBUTE -->
 
-And that's it, your web page will be ready in a few minutes.
+## 📝 Final note
+   This buildpack is unofficial that means i don't have any conection with Heroku or Google from Flutter developer team <!--Although I would like belonging to any of the two :D -->. This repository was made as a hobby, i'm always interested in learn new things, this is one demostration of that :)