examples: add a template example, update the regex examples (#8829)

examples/templates/readme.md

@@ -0,0 +1,14 @@
+# example how to work with templates
+
+- templates support
+  - if
+  - for loops
+  - even nesting of for loops
+  - syntax checking
+  - embed the template into the binary
+
+Its a very cool way how to do also do e.g. system administration, fill in 
+config files, etc...
+
+The example there is also a good demonstration of how to use json on a more 
+complex object and read/write to file.