added webmethods related gitignore file

webMethods.gitignore

+#files
+*.bak
+*.class
+
+#licensefile
+Apache_License.txt
+
+#folders
+IntegrationServer/lib/
+IntegrationServer/datastore/
+IntegrationServer/db/
+IntegrationServer/DocumentStore/
+IntegrationServer/lib/
+IntegrationServer/logs/
+IntegrationServer/replicate/
+IntegrationServer/sdk/
+IntegrationServer/support/
+IntegrationServer/update/
+IntegrationServer/userFtpRoot/
+IntegrationServer/web/
+IntegrationServer/WmRepository4/
+IntegrationServer/XAStore/