Improve developer docs

CONTRIBUTING.md

@@ -14,6 +14,10 @@ Few pointers for contributions:
 If you are unsure, discuss the feature on our [Slack](https://join.slack.com/t/highfrequencybot/shared_invite/enQtMjQ5NTM0OTYzMzY3LWMxYzE3M2MxNDdjMGM3ZTYwNzFjMGIwZGRjNTc3ZGU3MGE3NzdmZGMwNmU3NDM5ZTNmM2Y3NjRiNzk4NmM4OGE)
 or in a [issue](https://github.com/freqtrade/freqtrade/issues) before a PR.
 
+## Getting started
+
+Best start by reading the [documentation](https://www.freqtrade.io/) to get a feel for what is possible with the bot, or head straight to the [Developer-documentation](https://www.freqtrade.io/en/latest/developer/) (WIP) which should help you getting started.
+
 ## Before sending the PR:
 
 ### 1. Run unit tests
@@ -41,12 +45,6 @@ pytest freqtrade/tests/test_<file_name>.py::test_<method_name>
 
 ### 2. Test if your code is PEP8 compliant
 
-#### Install packages
-
-```bash
-pip3.6 install flake8 coveralls
-```
-
 #### Run Flake8
 
 ```bash
@@ -60,22 +58,12 @@ Guide for installing them is [here](http://flake8.pycqa.org/en/latest/user/using
 
 ### 3. Test if all type-hints are correct
 
-#### Install packages 
-
-``` bash
-pip3.6 install mypy
-```
-
 #### Run mypy
 
 ``` bash
 mypy freqtrade
 ```
 
-## Getting started
-
-Best start by reading the [documentation](https://github.com/freqtrade/freqtrade/blob/develop/docs/index.md) to get a feel for what is possible with the bot, or head straight to the [Developer-documentation](https://github.com/freqtrade/freqtrade/blob/develop/docs/developer.md) (WIP) which should help you getting started.
-
 ## (Core)-Committer Guide
 
 ### Process: Pull Requests

docs/developer.md

@@ -4,8 +4,20 @@ This page is intended for developers of FreqTrade, people who want to contribute
 
 All contributions, bug reports, bug fixes, documentation improvements, enhancements and ideas are welcome. We [track issues](https://github.com/freqtrade/freqtrade/issues) on [GitHub](https://github.com) and also have a dev channel in [slack](https://join.slack.com/t/highfrequencybot/shared_invite/enQtMjQ5NTM0OTYzMzY3LWMxYzE3M2MxNDdjMGM3ZTYwNzFjMGIwZGRjNTc3ZGU3MGE3NzdmZGMwNmU3NDM5ZTNmM2Y3NjRiNzk4NmM4OGE) where you can ask questions.
 
+## Documentation
 
-## Module 
+Documentation is available at [https://freqtrade.io](https://www.freqtrade.io/) and needs to be provided with every new feature PR.
+
+Special fields for the documentation (like Note boxes, ...) can be found [here](https://squidfunk.github.io/mkdocs-material/extensions/admonition/).
+
+## Developer setup
+
+To configure a development environment, use best use the `setup.sh` script and answer "y" when asked "Do you want to install dependencies for dev [y/N]? ".
+Alternatively (if your system is not supported by the setup.sh script), follow the manual installation process and run `pip3 install -r requirements-dev.txt`.
+
+This will install all required tools for development, including `pytest`, `flake8`, `mypy`, and `coveralls`.
+
+## Modules
 
 ### Dynamic Pairlist