docs(count-files): adding examples

subjects/devops/count-files/README.md

@@ -17,8 +17,27 @@ $
 Here are some Commands that can help you:
 
 - `find`. Find files or directories under the given directory tree, recursively.
+
+Find all php files in a directory:
+
+```console
+$ find . -type f -name "*.php"
+
+./tec.php
+./login.php
+./index.php
+```
+
 - `wc`. Count lines, words, and bytes.
 
+```console
+$ cat README.md
+this is a simple example
+with two lines
+$ wc -lwc example.md
+ 2  8 40 example.md
+```
+
 > You have to use Man or Google to know more about commands flags, in order to solve this exercise!
 > Google and Man will be your friends!