[RK] Add coverage tool (#51)

Author: regan-karlewicz

.gitignore

@@ -3,3 +3,4 @@ build
 .DS_Store
 node_modules
 *.swp
+.nyc_output

.nycrc

@@ -0,0 +1,5 @@
+{
+    "extends": "@istanbuljs/nyc-config-typescript",
+    "exclude": ["build", "example-consuming-client", "test"],
+    "all": true
+}