Add .NET passwordless, Python connection-string, and Go CRUD initial samples

.github/workflows/validate.yml

@@ -30,8 +30,8 @@ jobs:
               echo "::error::$name does not follow NNN-kebab-case naming"
               exit 1
             fi
-            if [ ! -f "${sample}README.md" ]; then
-              echo "::error::$name is missing README.md"
+            if [ ! -f "${sample}readme.md" ]; then
+              echo "::error::$name is missing readme.md"
               exit 1
             fi
           done

.gitignore

@@ -0,0 +1,5 @@
+# macOS
+.DS_Store
+
+# JetBrains
+.idea/