Merge branch '5-update-readme' into 'master'

Update README.md

Closes #5

See merge request !6

README.md

 # Frozen components
 
 ## What is that?
-A collection of plugins that allow the user to include components from _frozen-pages_ layout
+A collection of Jekyll plugins (tags and filters) that allow the user to include components from _frozen-pages_ layout seamlessly.
 
 ## How to use?
-**Note, that this repository does not contain CSS files!** They stay within the theme.
+There are two changes to be made in your Jekyll project in order to use this:
+* in `Gemfile`, inside `group :jekyll_plugins do` add the following:
 
-More information to be added.
+```
+ gem 'jekyll-theme-lcsb-frozen-components', 
+     '~> 0.0.1', 
+     :git => "https://git-r3lab.uni.lu/core-services/jekyll-theme-lcsb-frozen-components.git", 
+     :branch => "master"
+```
+
+Example:
+
+```
+group :jekyll_plugins do
+ gem "jekyll-paginate-v2", 
+     "~> 2",
+     :git => "https://github.com/sverrirs/jekyll-paginate-v2.git"
+
+ gem "jekyll-feed", 
+     "~> 0.6"
+
+ gem 'jekyll-theme-lcsb-frozen-components', 
+     '~> 0.0.1', 
+     :git => "https://git-r3lab.uni.lu/core-services/jekyll-theme-lcsb-frozen-components.git", 
+     :branch => "master"
+end
+```
+
+* in `_config.yml`, inside `plugins:`, add the following:
+
+```
+  - jekyll-theme-lcsb-frozen-components
+```
+
+Example:
+
+```
+plugins:
+  - jekyll-feed
+  - jekyll-paginate-v2
+  - jekyll-theme-lcsb-frozen-components
+```
+
+## Developer's notes
+
+1. **Note, that this repository does not contain CSS files!** They stay within the theme.
+2. The code is contained in `lib` directory
+2. When you add a new file containing source code, don't forget to register it in `lib/jekyll-theme-lcsb-frozen-components.rb` with `require`.
 
 ## License
 **Apache2**, see LICENSE
-
-## Contributing
-To be filled in