create documentation of button component

docs/button.md

@@ -3,3 +3,135 @@ id: button
 title: Button
 wip: true
 ---
+
+A basic button component that should render nicely on any platform. Supports a minimal level of customization.
+
+If this button doesn't look right for your app, you can build your own button using [Pressable](pressable).
+
+```res
+<Button
+  onPress={onPressLearnMore}
+  title="Learn More"
+  color="#841584"
+  accessibilityLabel="Learn more about this purple button"
+/>
+```
+
+## Example
+
+```res
+open ReactNative
+
+let styles = {
+  open Style
+  StyleSheet.create({
+    "title": textStyle(~fontSize=24., ~fontWeight=#_600, ()),
+  })
+}
+
+@react.component
+let app = () => {
+  <SafeAreaView>
+    <StatusBar />
+    <ScrollView contentInsetAdjustmentBehavior=#automatic>
+      <Text style={styles["title"]}> {"Button component"->React.string} </Text>
+      <Button
+        onPress={(_) => 
+          Alert.alert(
+            ~title="Button pressed",
+            ~message="The button is pressed and show this alert",
+            (),
+          )
+        }
+        title="Press me"
+        color="#841584"
+        accessibilityLabel="Learn more about this purple button"
+        />
+       <Button
+        title="Press me"
+        color="#f194ff"
+        onPress={(_) => 
+          Alert.alert(
+            ~title="Button pressed",
+            ~message="Button with adjusted color pressed",
+            (),
+          )
+        }
+      />
+    </ScrollView>
+  </SafeAreaView>
+}
+```
+
+---
+
+# Reference
+
+## Props
+
+### Required **`onPress`**
+
+Handler to be called when the user taps the button.
+
+| Type                               |
+| ---------------------------------- |
+| function(PressEvent) |
+
+---
+
+### Required **`title`**
+
+Text to display inside the button. On Android the given title will be converted to the uppercased form.
+
+| Type   |
+| ------ |
+| string |
+
+---
+
+### `accessibilityLabel`
+
+Text to display for blindness accessibility features.
+
+| Type   |
+| ------ |
+| string |
+
+---
+
+### `color`
+
+Color of the text (iOS), or background color of the button (Android).
+
+| Type            | Default                                                                                                                                                                                                                                   |
+| --------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| colors in hex | 
+
+---
+
+### `disabled`
+
+If `true`, disable all interactions for this component.
+
+| Type | Default |
+| ---- | ------- |
+| bool | `false` |
+
+---
+### `testID`
+
+Used to locate this view in end-to-end tests.
+
+| Type   |
+| ------ |
+| string |
+
+---
+
+### `touchSoundDisabled` <div class="label android">Android</div>
+
+If `true`, doesn't play system sound on touch.
+
+| Type    | Default |
+| ------- | ------- |
+| boolean | `false` |