[Generator][TypeScript] Implement Code Coverage (#1363)

* Implement nyc framework

* Configuration nyc

* Update npm and git ignore

* Improvement for after method in generator

Author: Batta32

templates/Virtual-Assistant-Template/typescript/generator-botbuilder-assistant/.gitignore

@@ -0,0 +1,12 @@
+# node.js dependencies folder
+node_modules/
+
+# Bot Files
+*.bot
+
+#generator tests
+test/
+
+#coverage
+coverage
+.nyc_output

templates/Virtual-Assistant-Template/typescript/generator-botbuilder-assistant/.npmignore

@@ -5,4 +5,8 @@ node_modules/
 *.bot
 
 #generator tests
-test/
+test/
+
+#coverage
+coverage
+.nyc_output

templates/Virtual-Assistant-Template/typescript/generator-botbuilder-assistant/.nycrc

@@ -0,0 +1,21 @@
+{
+  "extension": [
+    ".js"
+  ],
+  "include": [
+    "generators/"
+  ],
+  "exclude": [
+    "node_modules/**",
+    "test/**",
+    "coverage/**",
+    "generators/**/templates/**/deployment/",
+    "generators/**/templates/**/test/"
+  ],
+  "reporter": [
+    "html",
+    "text"
+  ],
+  "all": true,
+  "cache": true
+}