Add screenshot and OARS (#68)

Author: danirabbit

README.md

@@ -4,6 +4,8 @@
 
 The camera app designed for elementary OS
 
+![Camera Screenshot](data/screenshot.png?raw=true)
+
 ## Building, Testing, and Installation
 
 You'll need the following dependencies:

data/io.elementary.camera.appdata.xml.in

@@ -15,6 +15,40 @@
   <provides>
     <binary>io.elementary.camera</binary>
   </provides>
+  <screenshots>
+    <screenshot type="default">
+      <image>https://raw.githubusercontent.com/elementary/camera/master/data/screenshot.png</image>
+    </screenshot>
+  </screenshots>
+  <content_rating type="oars-1.1">
+    <content_attribute id="violence-cartoon">none</content_attribute>
+    <content_attribute id="violence-fantasy">none</content_attribute>
+    <content_attribute id="violence-realistic">none</content_attribute>
+    <content_attribute id="violence-bloodshed">none</content_attribute>
+    <content_attribute id="violence-sexual">none</content_attribute>
+    <content_attribute id="violence-desecration">none</content_attribute>
+    <content_attribute id="violence-slavery">none</content_attribute>
+    <content_attribute id="violence-worship">none</content_attribute>
+    <content_attribute id="drugs-alcohol">none</content_attribute>
+    <content_attribute id="drugs-narcotics">none</content_attribute>
+    <content_attribute id="drugs-tobacco">none</content_attribute>
+    <content_attribute id="sex-nudity">none</content_attribute>
+    <content_attribute id="sex-themes">none</content_attribute>
+    <content_attribute id="sex-homosexuality">none</content_attribute>
+    <content_attribute id="sex-prostitution">none</content_attribute>
+    <content_attribute id="sex-adultery">none</content_attribute>
+    <content_attribute id="sex-appearance">none</content_attribute>
+    <content_attribute id="language-profanity">none</content_attribute>
+    <content_attribute id="language-humor">none</content_attribute>
+    <content_attribute id="language-discrimination">none</content_attribute>
+    <content_attribute id="social-chat">none</content_attribute>
+    <content_attribute id="social-info">none</content_attribute>
+    <content_attribute id="social-audio">none</content_attribute>
+    <content_attribute id="social-location">none</content_attribute>
+    <content_attribute id="social-contacts">none</content_attribute>
+    <content_attribute id="money-purchasing">none</content_attribute>
+    <content_attribute id="money-gambling">none</content_attribute>
+  </content_rating>
   <developer_name>elementary LLC.</developer_name>
   <url type="homepage">http://elementary.io/</url>
   <url type="bugtracker">https://github.com/elementary/camera/issues</url>