Add initial maintenance docs

source/developers/maintenance.markdown

@@ -0,0 +1,42 @@
+---
+layout: page
+title: "Maintenance"
+description: "Steps involved to maintain the current state of Home Assistant."
+date: 2016-09-13 17:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+---
+
+This page documents a couple of points for maintaining the Home Assistant code. Most of the tasks don't need to be performed on a regular base thus the steps, used tools, or details are preserved here.
+
+### {% linkable_title Line separator %}
+
+People are using various operating systems to develop components and platforms for Home Assistant. This could lead to different line endings on file. We prefer `LN`. Especially Microsoft Windows tools tend to use `CRLF`.
+
+```bash
+$ find homeassistant -name "*.py" -exec file {} \; | grep BOM
+$ find homeassistant -name "*.py" -exec file {} \; | grep CRLF
+```
+
+To fix the line spearator, use `dos2unix` or `sed`.
+
+```bash
+$ dos2unix homeassistant/components/notify/kodi.py
+```
+
+### {% linkable_title Dependencies %}
+
+A lot of components and platforms depends on third-party Python modules. The dependencies which are stored in the `requirements_*.txt` files are tracked by [gemnasium](https://gemnasium.com/github.com/home-assistant/home-assistant) and [Requires.io](https://requires.io/github/home-assistant/home-assistant/requirements/?branch=dev).
+
+If you update the requirements of a component/platform through the `REQUIREMENTS = ['modules-xyz==0.3']` entry, run the provided script to update the `requirements_*.txt` file(s).
+
+```bash
+$ script/gen_requirements_all.py 
+```
+
+Start a test run of Home Assistant if that was successful include all files in a Pull Request. Add a short summary of the changes, a sample configuration entry, details about the tests, and other useful information to the description.
+
+
+