Merge pull request #289 from jverzani/documenter

update basicUsage document

Author: jverzani

docs/Project.toml

@@ -1,6 +1,8 @@
 [deps]
 Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
 SymEngine = "123dc426-2d89-5057-bbad-38513e3affd8"
+SymbolicUtils = "d1185830-fcd6-423d-90d6-eec64667417b"
+TermInterface = "8ea1fca8-c5ef-4a55-8b96-4e9afe9c9a3c"
 
 [compat]
-Documenter = "1"
+Documenter = "1"