[enh] Add basic readme.

README.md

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+# Prosopopee
+
+More or less a small clone of exposure.co in form of a static generator.
+
+## Requirements
+
+Installation needs Python, pip and virtualenv
+
+    apt-get install python-pip python-virtualenv
+
+Gallery building needs graphicsmagick library
+
+    apt-get install graphicsmagick
+
+## Installation
+
+1. Create a virtualenv, and activate it
+
+    virtualenv venv
+    source venv/bin/activate
+
+2. Download and install Prosopopee
+
+    pip instal git+https://github.com/Psycojoker/prosopopee
+
+
+## Usage
+
+Note: You need to be in an activated virtualenv.
+
+In a folder containing a proper settings.yaml file, simply do
+
+    prosopopee
+
+A `build` folder will be created in the current directory, containing an
+index.html, static files (css & js) and pictures.
+
+### Settings file
+
+A `settings.yaml` file is required on each gallery folder.
+
+Here is an example:
+
+```yaml
+title: Gallery title
+sub_title: Gallery sub-title
+date: 2016-01-15
+cover: my_cover_picture.jpg
+sections:
+  - type: full-picture
+    image: big_picture.jpg
+    text:
+      title: Big picture title
+      sub_title: Some text
+      date: 2016-01-15
+  - type: pictures-group
+    images:
+      -
+        - image1.jpg
+        - image2.jpg
+        - image3.jpg
+      -
+        - image4.jpg
+        - image5.jpg
+  - type: text
+    text: Some text, HTML <b>is allowed</b>.
+  - type: bordered-picture
+    image: another_picture.jpg
+```