Update README with contribution instructions

README.md

@@ -1,3 +1,55 @@
 # dnsmanager-website
 
-Prototype for a dnsmanager homepage
+Prototype for a dnsmanager homepage
+
+# Blog
+
+## Create a new article
+
+Create a new folder in the content/blog/YEAR/ folder. index.md is the English version, with the extension prefixed by the language code for translations.
+
+Each post has some TOML metadata attached. This is called a frontmatter, and the available variables are described in the [Zola documentation](https://www.getzola.org/documentation/content/page/#front-matter):
+
+```
++++
+title = "My article"
+date = 2020-03-29
++++
+
+My article!
+```
+
+## Post summaries
+
+The post summary is taken from the first part of the article. If you add a `<-- more -->` tag, everything before that will be treated as the post summary.
+
+# Translations
+
+## How to add a new language
+
+Adding a language is not hard, but it takes a few steps. The example here takes `fr` as language code for french translations, just replace it with your own language.
+
+In config.toml:
+- declare the language in the languages variable: `{code = "fr", rss = true}`
+- translate the basic template strings in the translations section:
+
+```
+[translations.fr]
+source = "Source de cette page"
+readmore = "Lire la suite"
+```
+
+Now you can translate the Markdown pages in the content folder. The translated page should have the language code before the .md extension, like `index.fr.md`. The homepage is translated from content/_index.md, and some common parts (such as the navigation bar) are located in the content/_common folder.
+
+Warning: don't forget to copy the placeholder section file for year-folders in the blog, otherwise no article will appear on your language's blog. You can safely copy content/2020/_index.md to, say, content/2020/_index.fr.md.
+
+# TODO
+
+- [ ] blog
+  - [x] basic blog
+  - [ ] pagination
+  - [x] summaries
+- [x] i18n
+  - [x] pages
+  - [x] blogposts
+  - [x] other strings in the templates