Added readme and license

README.MD

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+# grpkill
+
+A linux command to kill a specific process.
+
+It will only kill when the all the following criteria are met:
+
+ - The current user is in the same group as the egid of grpkill
+ - The process to kill has the same gid as the egid of grpkill
+
+grpkill will also fail when:
+
+ - The argument count is not equal to 2
+ - The first argument is not an integer
+
+## License
+This project is licensed under the MIT license. You may copy and modify it to your liking. But may not sell it.
+
+I am not responsible for processes being killed that shouldn't have been killed ;)