spec: Add variable invocation

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+---
+title: Variable invocation
+version: 1.0.0
+state: draft
+---
+
+# Variable invocation
+
+Variable invocation is the act of referring to a variable's name in order to invoke its value.  
+
+The variable invocation grammar is to be replaced with the value of the variable. 
+
+## Grammar
+
+A variable invocation is represented by the following grammar:
+
+```
+${VARNAME}
+```
+
+Where VARNAME is a valid variable that has been previously declared using the grammar specified in [variable-declaration](variable-declaration.md)