Add release notes for 3.γ

RELEASE-NOTES-3.c

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+Release notes for i3 v3.γ
+-----------------------------
+
+This is the third version (3.γ, transcribed 3.c) of i3. It is considered stable.
+
+This release contains many small improvements like using keysymbols in the
+configuration file, named workspaces, borderless windows, an IPC interface
+etc. (see below for a complete list of changes)
+
+Thanks for this release go out to bapt, badboy, Atsutane, tsdh, xeen, mxf,
+and all other people who reported bugs/made suggestions.
+
+Special thanks go to steckdenis, yellowiscool and farvardin who designed a logo
+for i3.
+
+A list of changes follows:
+
+  * Implement a reload command
+  * Implement keysymbols in configuration file
+  * Implement assignments of workspaces to screens
+  * Implement named workspaces
+  * Implement borderless/1-px-border windows
+  * Implement command to focus screens
+  * Implement IPC via unix sockets
+  * Correctly render decoration of floating windows
+  * Map floating windows requesting (0x0) to center of their leader/workspace
+  * Optimization: Render stack windows on pixmaps to reduce flickering
+  * Optimization: Directly position new windows to their final position
+  * Bugfix: Repeatedly try to find screens if none are available
+  * Bugfix: Correctly redecorate clients when changing focus
+  * Bugfix: Don’t crash when clients reconfigure themselves
+  * Bugfix: Fix screen wrapping
+  * Bugfix: Fix selecting a different screen with your mouse when not having
+    any windows on the current workspace
+  * Bugfix: Correctly unmap stack windows and don’t re-map them too early
+  * Bugfix: Allow switching layout if there are no clients in the this container
+  * Bugfix: Set WM_STATE_WITHDRAWN when unmapping, unmap windows when
+    destroying
+  * Bugfix: Don’t hide assigned clients to inactive but visible workspaces
+
+-- Michael Stapelberg, 2009-08-19