add: doc photodown

doc/photodown/gallery.md

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+# Block
+
+## Usage
+
+```
++++++
+config
+---
+style
+---
+content
++++++
+```
+
+### Config
+
+| type |
+| --- |
+| image-list |
+
+| direction |
+| --- |
+| down |
+| up |
+| left |
+| right |
+
+
+
+### Style
+Just css
+
+
+### Content
+
+```
+![img1]
+description 1
+--
+![img2]
+description 2
+--
+...
+```
+
+| name | usage |
+| --- | --- |
+| style | Your custom css, multiline supported |
+| content | Your bozodown | 
+
+## Effect
+
+Create a group of image

doc/photodown/image.md

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+# Image
+
+Permit you to use your own image without think about small, thumb, large, reference the bulk page. Always permit you to use external image with the url
+
+## Usage
+
+```
+![./bulk/path_to_image/image_large_name_without_ext]
+```
+
+## Example
+On my server I got this image `bulk/01613/01613.png`, so I will used put
+```
+![./bulk/01613/01613]
+```
+And the python will display an image clickable who link to the bulk page 

doc/photodown/readme.md

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+# PhotoDown
+
+Just a simple extension of [BozoDown](../bozodown/readme.md)
+
+## Add
+
+- [Pictures gallery]()
+
+## Modify
+
+- [image](./image.md)

doc/readme.md

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+# PhotoHUB
+
+## Tools
+
+### Generate page
+To let user create his own page this project use [BozoDown](./bozodown/readme.md) with the [PhotoDown](./photodown/readme.md) extension