move download link from emacs-mac-port wiki to this repo

Downloads.md

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+### Emacs mac port:
+
+- emacs-24.5-rc1-mac-5.6: [download](https://s3.amazonaws.com/emacs-mac-port/emacs-24.5-rc1-mac-5.6.zip)
+
+  SHA256: 073ea8c28c6d26a658bbd227b35a01f668e82f1e049d0855529a017a74b6bbd1
+
+- emacs-24.4.91-mac-5.5: [download](https://s3.amazonaws.com/emacs-mac-port/emacs-mac-port-24.4.91-mac-5.5.zip)
+
+  SHA256: 4627f1778b0bb4fbfece14deb88e14d00fd8d0a6dc3535b686be92e78dc60f55
+
+- emacs-24.4.90-mac-5.4: [download](https://s3.amazonaws.com/emacs-mac-port/emacs-mac-port-24.4.90-mac-5.4.zip)
+
+  SHA256: 7146fb86bad8a398832a295a2472b7c8bb73a489616e04a536667b5d565b184b
+
+
+### Emacs mac port with official Emacs icon (the "E" and a pen): 
+
+- emacs-24.5-rc1-mac-5.6: [download](https://s3.amazonaws.com/emacs-mac-port/emacs-24.5-rc1-mac-5.6-official-icon.zip)
+
+  SHA256: 8da364286d33089a5b20a65bd1510466f126e09bb537e44e3dbb8bece346fc7b
+
+- emacs-24.4.91-mac-5.5: [download](https://s3.amazonaws.com/emacs-mac-port/emacs-mac-port-24.4.91-mac-5.5-official-icon.zip)
+
+  SHA256: aecc44daf65fb63268bf400ee540273b48d92be8685f07fd0ce7bed316263b5a
+
+- emacs-24.4.90-mac-5.4: [download](https://s3.amazonaws.com/emacs-mac-port/emacs-mac-port-24.4.90-mac-5.4-official-icon.zip)
+
+  SHA256: a52edd78ee0804b04915164e06f442f151bac3482f9073e292546408884ace9e
+
+
+_*Tested on Mac OS X 10.10.2/10.9.5_