Slider & Text Input (#12)

* WIP Slider

* Text Input component

* Finalized

* Finishing touches

* remove styles

* Fix sizes and colors

* Fix text input being too restrictive

* Fix enter being ignored

* Fixed duplicate export

docs/components/slider.md

@@ -0,0 +1,9 @@
+# Slider
+
+<DemoContainer>
+  <Slider :min="1000" :max="10000" :step="1000"/>
+</DemoContainer>
+
+```vue
+<Slider :min="1000" :max="10000" :step="1000"/>
+```