Adding instructions for running binary, mac.

README.md

@@ -47,6 +47,37 @@ After that, you may run the binary as any normal program:
 ```
 ./shark-clipper-linux-x64-latest.bin
 ```
+#### Using the Mac Prebuilt Binary
+You will need to set execute permissions on the Mac prebuilt binary, e.g.:
+```
+chmod +x shark-clipper-macos-x64-latest.bin
+```
+
+Mac requires an additional security step to run the prebuilt binary.
+This step needs to be done every time a new binary is downloaded and run for the first time.
+
+1) Run the binary as any normal program:
+```
+./shark-clipper-macos-x64-latest.bin
+```
+
+2) A popup may appear noting that the file cannot be opened because Apple cannot chcck it for malicious software, click "OK" to close.
+
+3) Open System Settings and navigate to the "Privacy & Security" tab. 
+
+4) Scroll down until arriving at the "Security" section where a message should appear stating that shark-clipper.bin was blocked because it is not from an identified developer. Click the "Allow Anyway" button. You may be required to provide a password.
+
+5) Return to the terminal and re-run the binary:
+```
+./shark-clipper-macos-x64-latest.bin
+```
+
+6) A popup may appear again warning about running the file. This time click the "Open" button. To program should now proceed.
+
+After following these steps when first running a new binary, you will be able to run the binary as any normal program without warnings:
+```
+./shark-clipper-macos-x64-latest.bin
+```
 
 #### Using the Windows Prebuilt Binary