Initial Atom (RSS-like) feed support (#284)

* initial Atom (RSS-like) feed support

* Update _config.yml

Gemfile

@@ -2,6 +2,7 @@ source 'https://rubygems.org'
 group :jekyll_plugins do
     gem 'jekyll'
     gem 'jekyll-email-protect'
+    gem 'jekyll-feed'
     gem 'jekyll-github-metadata'
     gem 'jekyll-paginate-v2'
     gem 'jekyll-scholar'

README.md

@@ -234,6 +234,12 @@ If you have a different question, please ask using [Discussions](https://github.
    If you are deploying a project page to GitHub Pages, leave `url` blank and set `baseurl: /<your-project-name>/`.
    Generally, if you are deploying your webpage to `your-domain.com/your-project/`, you must set `url: your-domain.com` and `baseurl: /your-project/`.
 
+4. **Q:** Atom feed doesn't work. Why?
+   <br>
+   **A:** Make sure to correctly specify the `url` and `baseurl` paths in `_config.yml`.
+  RSS Feed plugin works with these correctly set up fields: `title`, `url`, `description` and `author`.
+  Make sure to fill them in an appropriate way and try again.
+
 ## Features
 
 ### Publications
@@ -343,6 +349,10 @@ This can be configured on a per-page basis, by setting the `og_image` page varia
 If for an individual page this variable is not set, then the theme will fall back to a site-wide `og_image` variable, configurable in your `_config.yml`.
 In both the page-specific and site-wide cases, the `og_image` variable needs to hold the URL for the image you wish to display in social media previews.
 
+#### Atom (RSS-like) Feed
+It generates an Atom (RSS-like) feed of your posts, useful for Atom and RSS readers.
+The feed is reachable simply by typing after your homepage `/feed.xml`.
+E.g. assuming your website mountpoint is the main folder, you can type `yourusername.github.io/feed.xml`
 
 ## Contributing
 

_config.yml

@@ -20,6 +20,12 @@ baseurl: /al-folio # the subpath of your site, e.g. /blog/
 last_updated: false # set to true if you want to display last updated in the footer
 impressum_path:  # set to path to include impressum link in the footer, use the same path as permalink in a page, helps to conform with EU GDPR
 
+# -----------------------------------------------------------------------------
+# RSS Feed
+# -----------------------------------------------------------------------------
+# will use title and url fields
+# Take a look to https://github.com/jekyll/jekyll-feed for more customization
+
 # -----------------------------------------------------------------------------
 # Layout
 # -----------------------------------------------------------------------------
@@ -129,6 +135,7 @@ keep_files:
 plugins:
   - jekyll-email-protect
   - jekyll-github-metadata
+  - jekyll-feed
   - jekyll-paginate-v2
   - jekyll/scholar
   - jekyll-twitter-plugin