Added Twitter Card Support (alshedivat#120)

* Feature Request : alshedivat#85

* Created sample blog post for tweet card examples.

* Added twitter plugin dependency : https://github.com/rob-murray/jekyll-twitter-plugin

* Added .tweet-cache/ to .gitignore.

.gitignore

@@ -4,4 +4,4 @@ _site
 .DS_store
 .ruby-version
 Gemfile.lock
-
+.tweet-cache/

Gemfile

@@ -5,6 +5,7 @@ group :jekyll_plugins do
     gem 'jekyll-email-protect'
     gem 'jekyll-paginate-v2'
     gem 'jekyll-scholar'
+    gem 'jekyll-twitter-plugin'
     gem 'jemoji'
     gem 'unicode_utils'
 end

_config.yml

@@ -114,6 +114,7 @@ plugins:
   - jekyll-paginate-v2
   - jekyll/scholar
   - jemoji
+  - 'jekyll-twitter-plugin'
   # - bootstrap
   # - material-sass
 

_posts/2020-09-28-twitter.md

@@ -0,0 +1,26 @@
+---
+layout: post
+title: a post with twitter
+date: 2020-09-28 11:12:00-0400
+description: an example of a blog post with twitter
+---
+A sample blog page that demonstrates the inclusion of Tweets/Timelines/etc.
+
+<br />
+
+# Tweet
+An example of displaying a tweet : 
+{% twitter https://twitter.com/rubygems/status/518821243320287232 %}
+<br />
+<br />
+<br />
+<br />
+# Timeline
+An example of pulling from a timeline : 
+{% twitter https://twitter.com/jekyllrb maxwidth=500 limit=3 %}
+<br />
+<br />
+<br />
+<br />
+# Additional Details
+For more details on using the plugin visit : https://github.com/red-data-tools/jekyll-jupyter-notebook