Add markdown changelog

CHANGELOG.md

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+### Future release
+
+* New launcher icon
+* Switch to proper updates notification iconography
+* List anti-features on the App Details screen
+* New App Details option: Ignore All Updates
+* New App Details option: Ignore This Update
+* Problems with notifications should now be gone
+* Fix ActionBar Up navigation on some devices
+* Filter applications by native code architecture
+* Reorganize Preferences page
+* Grouped all app donation options in a submenu
+* Add Litecoin donation support
+* App filter settings now take effect immediately
+* Show Apk native code ABIs in expert mode
+* Handle market://search and fdroid.search: uris
+* Minor fixes to spacings and layouts
+* Other minor bug fixes
+* Translation updates
+
+### 0.50 (20-08-2013)
+
+* New basic app sharing functionality
+* Handle f-droid.org web repo as well as market:// app uris
+* Search by just typing on main screen and search results screen
+* Flattr and Bitcoin donation methods added
+* Noticeable speedups when returning from installs and uninstalls
+* Add back to home buttons to the ActionBar
+* Don't recommend versions newer than the current or incompatible with the device
+* Use standard Android cache locations rather than .fdroid on the SD card
+* Fix for crash at boot time where the SD card was slow to initialise
+* Lots of bug fixes
+* Lots of translation updates