Add adr for proposing an one-pager

This adr sums up roughly what was proposed and should be looked over
very good.

Author: Daniel Patanin

docs/adr/adr_0005.adoc

@@ -0,0 +1,41 @@
+[[ADR-0000]]
+= ADR-0005: Buying separate marketing oriented webpage
+
+[cols="h,d",grid=rows,frame=none,stripes=none,caption="Status",%autowidth]
+|====
+| Status
+| PROPOSED
+
+| Date
+| 2020-09-29
+
+| Author(s)
+| Daniel Patanin daniel.patanin@iteratec.com
+|====
+
+== Context
+
+As our requirements about our homepage changed we no longer just want to give a simple overview about our project on our landing page as we did with our GatsbyJS based website, 
+but furthermore we require a marketing oriented webpage additionally to our documentation site (for more on that see <<ADR-0004>>). This marketing page should satisfy following aspects:
+
+- Modern, ideally timeless, design
+- Overview about the secureCodeBox
+- Display of our project's advantages
+- Offer for service (prizing)
+- Encouragement for contacting us 
+- Encouragement for contributing
+
+== Decision
+
+Since there is no arguable reason to build such a one-pager ourselves, we should buy a ready to go solution for us. We are not aiming to invest extensive time neither in building such a page, 
+nor in gaining the desired design and marketing expertise, and also not hiring experts on this field (all this would actually be more expensive and time consuming than buying a site). 
+Some stores for such pages are: 
+
+- https://www.templatemonster.com/
+- https://onepagelove.com/templates
+- https://themeforest.net/tags/onepage
+
+== Consequences
+
+If we want to change the style or design someday, we probably could not reuse the bought template if it is not a minor change, thus would need to buy another template. 
+We also would have to orient the presentation of the secureCodeBox around the template we decide on, but nowadays we have a ginormous variety to choose from.