Improve contributing docs

Signed-off-by: Marco Ambrosini <marcoambrosini@pm.me>

DEVENV.md

@@ -0,0 +1,61 @@
+## Spin-up a quick nextcloud development instance 🚀
+
+### 1) Install the required packages ⛑
+
+* [php](https://www.php.net/manual/en/install.php)
+* php-gd
+* php-sqlite
+
+---
+
+### 2) Edit php.ini file to enable the installed extensions 🧰
+
+```
+sudo nano /etc/php/php.ini
+```
+
+Comment out `extension=gd` and `extension=pdo_sqlite`
+
+---
+
+### 3) Get nextcloud ☁️
+
+Clone the server repository:
+
+```
+git clone https://github.com/nextcloud/server.git
+```
+
+Update third party modules:
+
+```
+cd server  
+```
+
+```
+git submodule update --init
+```
+
+---
+
+## 4) Start server 🌐
+
+From within the server folder, execute:
+
+```
+ php -S 0.0.0.0:80
+```
+
+---
+
+## 5) Type 'localhost' in your browser and enjoy contributing! 🥂 🎉
+
+---
+
+### Install apps 👾
+
+\- If you want to install apps, you can directly go into your apps management;
+
+\- **but** if you want to work on apps development, just clone their git repository into the apps folder in the server folder;
+
+### Note: this is not an ideal permanent development environment. For a more stable and reliable platform, [please follow these instructions](https://docs.nextcloud.com/server/latest/developer_manual/general/devenv.html))

README.md

@@ -45,7 +45,7 @@ There are many ways to contribute, of which development is only one! Find out [h
 
 ### Development setup 👩‍💻
 
-1. 🚀 [Set up your local development environment](https://docs.nextcloud.com/server/latest/developer_manual/general/devenv.html)
+1. 🚀 [Set up your local development environment](./DEVENV.md)
 2. 🐛 [Pick a good first issue](https://github.com/nextcloud/server/labels/good%20first%20issue)
 3. 👩‍🔧 Create a branch and make your changes. Remember to sign off your commits using `git commit -sm "Your commit message"`
 4. ⬆ Create a [pull request](https://opensource.guide/how-to-contribute/#opening-a-pull-request) and `@mention` the people from the issue to review