nodejs 1.16 and dotnet 1.15 release configs (#338)

diff --git a/release-configs/runtime-dotnet-1.15.0.config b/release-configs/runtime-dotnet-1.15.0.config
new file mode 100644
index 0000000..e6a1e65
--- /dev/null
+++ b/release-configs/runtime-dotnet-1.15.0.config
@@ -0,0 +1,15 @@
+{
+  "versioning": {
+    "version": "1.15.0",
+    "pre_release_version": "rc1"
+  },
+  "RepoList": [
+    "openwhisk-runtime-dotnet"
+  ],
+  "openwhisk_runtime_dotnet": {
+    "name": "OpenWhisk Runtime Dotnet",
+    "hash": "5c23d6c6c5bf48486fe537befb0f8b00a908a36f",
+    "repository": "https://github.com/apache/openwhisk-runtime-dotnet.git",
+    "branch": "master"
+  }
+}
diff --git a/release-configs/runtime-nodejs-1.16.0.config b/release-configs/runtime-nodejs-1.16.0.config
new file mode 100644
index 0000000..3d39913
--- /dev/null
+++ b/release-configs/runtime-nodejs-1.16.0.config
@@ -0,0 +1,15 @@
+{
+  "versioning": {
+    "version": "1.16.0",
+    "pre_release_version": "rc1"
+  },
+  "RepoList": [
+    "openwhisk-runtime-nodejs"
+  ],
+  "openwhisk_runtime_nodejs": {
+    "name": "OpenWhisk Runtime Node.js",
+    "hash": "d96aee7495b26c872fe4aef01863be58d1162709",
+    "repository": "https://github.com/apache/openwhisk-runtime-nodejs.git",
+    "branch": "master"
+  }
+}