Add design doc template from Adrianna Foster

doc/design/design_doc_template.md

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+# Software Design Documentation
+
+<span style="font-size:larger;"><b>Project Name</b></span>
+
+**Date:**: 
+
+**Written By**: 
+
+## Introduction
+---------------------------------------
+*What is the goal of the software? What is the problem statement?*
+
+If there are any specification documents, link them in Appendix.
+
+## Solutions
+---------------------------------------
+*Section should include alternative implementations/solutions*
+
+Is it feasible? How much effort does it need for each approach? Pros/cons of each approach.
+
+Document alternatives, why you made the decision and how it will affect the team and project.
+
+## Design Considerations
+---------------------------------------
+Describe the issues that need to be addressed before creating a design solution.
+
+### Assumptions and Dependencies:
+Describe any assumptions that may be wrong or any dependencies on other things
+
+### General Contraints:
+Describe any constraints that could have an impact on the design of the software.
+
+## Design and Architecture
+---------------------------------------
+
+### System diagram or flowchart
+Interaction diagram of various inputs, outputs, sub systems and dependencies.
+
+### Algorithm or Pseudo code for main components
+Describe your logic in this section
+
+## Rollout Plan
+---------------------------------------
+Define the roll-out phases and tests you plan to do
+
+## Appendix
+---------------------------------------
+References, links to additional documentation
+
+## Review Sign-off
+---------------------------------------
+* Team lead:
+* Sponsor:
+
+*Sign-off Completed on YYYY-MM-DD*