Updated documentation to 0.4.0

docs_md/03-styles.md

@@ -9,6 +9,7 @@ In component API documentation, you can find the style API for this component. O
 
 ## Usage
 Setup default druid style for all druid instances via `druid.set_default_style`
+You can pass _nil_ or _empty_table_ to use default values for all components (no styles)
 ```lua
 local druid = require("druid.druid")
 local my_style = require("my.amazing.style")
@@ -41,3 +42,18 @@ local function init(self)
 	self.button:set_style(my_style)
 end
 ```
+
+
+## Create your own styles
+
+The most components have their styles. You can explore it on [Druid API](https://insality.github.io/druid/) in table style section ([button example](https://insality.github.io/druid/modules/druid.button.html#Style)). Or you can see, what fields component uses in code in function `on_style_change`
+
+To create you style, create lua module, what return <_component_name_, _component_style_> table
+
+Example: [default druid style](https://github.com/Insality/druid/blob/develop/druid/styles/default/style.lua)
+
+Override all fields you want and set your style with one of next ways:
+
+- Set your style as global via `druid.set_default_style`
+- Set style for concrete druid instance via `druid = druid.new(self, style)`
+- Set style for concrete instance via `component:set_style(style)`