Add some docs

README.md

@@ -24,6 +24,9 @@ It's an alternative to paid services like Dropbox, WeTransfer.
 * Requires Node >=7.4 or use `--harmony-async-await` flag
 * Password protected download list ([AES](https://en.wikipedia.org/wiki/Advanced_Encryption_Standard))  
 
+**See the blog posts about PsiTransfer: https://psi.cx/tags/PsiTransfer/ and checkout the 
+[Documentation](https://github.com/psi-4ward/psitransfer/tree/master/docs)**
+
 ![Screenshot](https://raw.githubusercontent.com/psi-4ward/psitransfer/master/docs/psitransfer.gif)
 
 **Demo**: https://transfer.psi.cx

docs/configuration.md

@@ -0,0 +1,40 @@
+# Configuration
+
+First of all, I'll give an overview about the configuration options. See the 
+[config.js](https://github.com/psi-4ward/psitransfer/blob/master/config.js#L5) for 
+possible values. I do **not** recommend changing this file directly, better use one
+of the following options.
+
+## Config file: NODE_ENV related
+
+PsiTransfer searches for an config file with the name `config.<NODE_ENV>.js` in the
+root folder where `<NODE_ENV>` stands for the value of the environment parameter `NODE_ENV`.
+If you start PsiTransfer using `npm start` it's `production` so you can create a
+`config.production.js` with your settings. For example take a look at 
+[config.dev.js](https://github.com/psi-4ward/psitransfer/blob/master/config.dev.js).
+This file is used when starting the application with `npm run dev`.
+
+You are completely free to introduce own configs like `config.custom.js` and start
+the app with `NODE_ENV=custom node app.js`.
+
+## Environment variables
+
+Some Linux distributions have `/etc/default/<daemon>` or `/etc/sysconfig/<daemon>`
+files with environment configurations. Moreover, it's common to 
+configure the behaviour of Docker containers using environment parameters.
+
+PsiTransfer supports overwriting every config value by environment parameters prefixed
+with `PSITRANSFER_`.
+
+```bash
+export NODE_ENV=dev
+export PSITRANSFER_RETENTIONS='{"one-time":"one time","3600":"1 Hour"}'
+export PSITRANSFER_PORT=8080
+node app.js
+```
+
+* The above example sets the `NODE_ENV` to `dev`.  
+  If `config.dev.js` exists, it is loaded and overwrites the corresponding values from `config.js`.
+* Then it will overwrite `retentions` and `port` with the values of the environment parameters.
+
+> Environment parameters always have the highest priority.

docs/deployment-docker.md

@@ -0,0 +1,29 @@
+# Deployment using Docker
+
+Using Docker is the most easy and recommended way to run PsiTransfer. There is an 
+[official Container](https://hub.docker.com/r/psitrax/psitransfer/) which is 
+updated whenever a GitHub push occurs.
+
+```bash
+docker run -d -v $PWD/data:/data -p 3000:3000 psitrax/psitransfer
+```
+The above command starts the PsiTransfer Docker container and 
+ * `-d` puts the process into background (daemon mode)
+ * `-v` mounts the data volume into the container
+ * `-p` forwards the traffic from port 3000 into the container
+
+**Protipp**: There are several [container tags](https://hub.docker.com/r/psitrax/psitransfer/tags/)
+if you want to use a specific version. E.g. `1` is always the latest stable `1.x.x` and `1.1`
+correlates with `1.1.x`.
+
+If you want to customize some PsiTransfer configurations use environment parameters
+by adding `-e` flags to the `docker run` command.
+
+```bash
+docker run -v $PWD/data:/data -p 3000:8080 \
+  -e PSITRANSFER_PORT=8080 \
+  -e PSITRANSFER_DEFAULTRETENTION=3600 \
+  psitrax/psitransfer
+```
+
+**Protipp**: By adding `--restart always` Docker will autostart the container after reboots.  

docs/deployment-systemd.md

@@ -0,0 +1,43 @@
+# Deployment as Systemd service 
+
+You can also install PsiTransfer as (Linux) system service. Most distributions
+use Systemd as main init system. You should **not** run PsiTransfer with root privileges!
+
+**Preparation**
+
+```bash
+# Create a target folder for PsiTransfer
+mkdir -p /opt/psitransfer
+cd /opt/psitransfer
+
+# Download and extract a prebuild
+curl -sL https://github.com/psi-4ward/psitransfer/releases/download/1.1.0-beta/psitransfer-1.1.0-beta.tar.gz | tar xz --strip 1
+
+# Install dependencies
+npm install --production
+
+# Add a user psitransfer
+sudo useradd --system psitransfer
+ 
+# Make psitransfer owner of /opt/psitransfer
+sudo chown -R psitransfer:psitransfer /opt/psitransfer 
+```
+
+**Systemd unit file**
+
+Grab the [psitransfer.service](https://github.com/psi-4ward/psitransfer/blob/master/docs/psitransfer.service)
+sample file, put it in `/etc/systemd/system/` and adjust to your needs.
+
+```bash
+cd /etc/systemd/system
+sudo wget https://raw.githubusercontent.com/psi-4ward/psitransfer/master/docs/psitransfer.service
+
+# Start the service
+sudo systemctl start psitransfer
+
+# Show the status
+sudo systemctl status psitransfer
+
+# Enable autostart on boot
+sudo systemctl enable psitransfer
+```

docs/layout-customization.md

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+# Layout customization
+
+It is easy to customize the look of PsiTransfer. Almost all functional components are encapsulated
+in the upload- and download-app and they only need a root element where they can be mounted.
+This elements must have the attribute `id="upload"` and `id="download"`, respectively.
+
+PsiTransfer uses [Bootstrap 3](http://getbootstrap.com/) as CSS-Framework and custom styles can
+be found in [public/assets/styles.css](https://github.com/psi-4ward/psitransfer/blob/master/public/assets/styles.css).
+
+If you want to give PsiTransfer your own custom look and feel just edit the files in `public/html` and/or
+the `styles.css`. If you need to deliver assets like a custom logo put it into the `assets` folder.
+
+But consider: You have to adopt further changes on PsiTransfer updates. This sould not happen very often.
+