feat: adding early lexicon of basic MAS-DT terms

README.md

+# Lexicon
+
+This is a dictionary of terms being used in the MAS-DT project which aims to be adopted across the Communications Backbone Ecosystem. 
+| Word                    | Meaning                                                                                                   |
+|-------------------------|-----------------------------------------------------------------------------------------------------------|
+| Action                  | A single behaviour a platform should perform, i.e go to a waypoint or change depth                        |
+| Action Sequence         | A set of Actions in an ordered list                                                                       |
+| Objective Generation UI | The user interface where a user creates a Specification                                                   |
+| Primitive               | A specification item that defines a objective/constraint that the Autonomy Engine must abide/work towards |
+| Specification           | A set of primitives that represents the overarching aim of a Campaign                                     |
+
+## Contributing
+
+Please suggest improvements or make additions in a Merge Request.