First draft of implementation (#1)

* First draft of implementation

Readme will follow

* Rename id.

* Exclude `commons-io` to disable build warnings

* Simplify metrics and add documentation

.yamllint

@@ -0,0 +1,19 @@
+extends: default
+
+## see https://yamllint.readthedocs.io/en/stable/rules.html
+rules:
+
+  # no need for document start
+  document-start: disable
+
+  # line length is not important
+  line-length: disable
+
+  # force double quotes everywhere
+  quoted-strings:
+    quote-type: double
+    required: only-when-needed
+
+  # allow everything on keys
+  truthy:
+    check-keys: false