Update README, make markdown, add link to upstream, add todo list

README.md

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+# dwm - dynamic window manager
+
+This is my fork of suckless's dwm, for my customizations/configurations.
+
+**Upstream:** `https://git.suckless.org/dwm/` or `git://git.suckless.org/dwm`
+
+## TODO
+
+- use patches i added:
+    - fibonacci (for spiral layout)
+    - stacker (for moving windows up and down stack)
+    - swallow (the replace-windows-in-place feature)
+    - xresources (maybe? for my theme-changing logic)
+