Add NEWS.md and update README.md

NEWS.md

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+# v0.1.0 2020-03-05
+
+Compile with wlroots 0.12.0 and wayland-server >=1.16
+
+This first release supports the following:
+- xdg-shell
+- optionally xwayland-shell
+- xbm buttons for maximize, iconify and close
+- layer-shell protocol (partial)
+- damage tracking to reduce CPU usage
+- very basic root-menu implementation
+- config and theme re-load on SIGHUP
+- openbox style autostart and environment files
+- 3 configuration options (openbox compatible)
+  - `<theme><name>`
+  - `<theme><font place="activewindow">`
+  - `<keyboard><keybind>`
+- 9 themes options (openbox compatible)
+  - `window.active.title.bg.color`
+  - `window.active.handle.bg.color`
+  - `window.inactive.title.bg.color`
+  - `window.active.button.unpressed.image.color`
+  - `window.inactive.button.unpressed.image.color`
+  - `menu.items.bg.color`
+  - `menu.items.text.color`
+  - `menu.items.active.bg.color`
+  - `menu.items.active.text.color`
+- 5 actions (openbox compatible)
+  - `<action name="Execute"><command>`
+  - `<action name="Exit">`
+  - `<action name="NextWindow">`
+  - `<action name="Reconfigure">`
+  - `<action name="ShowMenu"><menu>`
+