doc: Add readme.md file

- add properties yaml converter

readme.md

@@ -0,0 +1,36 @@
+# Simple Dev Utilities
+
+---
+
+<br>
+
+> Upload seemingly trivial utilities that may appear useless at first glance but could prove to be unexpectedly necessary or valuable
+
+<br>
+
+TOC
+
+[.properties -> .yaml format converter](#properties---yaml-format-converter)
+
+<br>
+
+### .properties -> .yaml format converter
+
+Convert .properties file format to .yaml file format.
+
+```kotlin
+class Test {
+
+    @Test
+    fun convertPropertiesToYaml() {
+        // given
+        val propertyString = "kotlin.code.style=official"
+        // when
+        val yamlConverter = YamlConverter()
+        val yamlString = yamlConverter.convertToYaml(propertyString)
+        // then
+        require("kotlin: \n   code: \n      style: official\n\n" == yamlString)
+    }
+
+}
+```