Add option to display project_timeframe to the project pages and home page (#289)

* Add project_timeline to the project template

Project timeline is sometimes very important aspect of your project as
it shows that you have been working on it for some time. This adds the
feature to the template, but only uses it when it is defined.

* Add description of a new feature to README

* Apply suggestions from code review

Co-authored-by: Victoria Drake <24644237+victoriadrake@users.noreply.github.com>

README.md

@@ -138,8 +138,11 @@ resources:
     - src: NameOfYourImage.jpg
       params:
           weight: -100
+project_timeframe: "June-December"
 ```
 
+You can add a `project_timeframe` parameter to the frontmatter of your project to optionally display an arbitrary string on the homepage and modal.
+
 ## Blog section
 
 Create an index file for the blog:

layouts/partials/home/projects.html

@@ -34,6 +34,9 @@
                             <a {{ if .Params.external_link }} href="{{ .Params.external_link }}" {{ end }}>
                                 {{ .Title | markdownify }}
                             </a>
+                            {{ if .Params.project_timeframe }}
+                            <p class="fa-xs">{{ .Params.project_timeframe }}</p>
+                            {{ end }}
                         </div>
                     </div>
                 </div>
@@ -58,7 +61,9 @@
                 <p class="modal-card-title has-text-centered">{{ . }}</p>
             </header>
             {{ end }}
-
+            {{ if .Params.project_timeframe }}
+            <p class="fa-xs">{{ .Params.project_timeframe }}</p>
+            {{ end }}
             {{ with .Resources.ByType "image" }}
             {{ $moreThenOneImage := gt (len .) 1 }}
             {{ if $moreThenOneImage }}