Merge branch 'add-license' into develop

Author: intitni

LICENSE

@@ -0,0 +1,19 @@
+Copyright (c) 2021 Shangxin Guo <int123c@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

README.md

@@ -28,11 +28,12 @@ You can install it via [Homebrew](http://brew.sh/):
 brew install --cask copilot-for-xcode
 ```
 
-Or install it manually,
+Or install it manually, by downloading the `Copilot for Xcode.app` from the latest [release](https://github.com/intitni/CopilotForXcode/releases), and extract it to the Applications folder.
 
-1. Download the `Copilot for Xcode.app` from the latest [release](https://github.com/intitni/CopilotForXcode/releases), and extract it to the Applications folder.
-2. Open the app, and click "Set Up Launch Agents" to set up a background running XPC Service that does the real job.
-3. Enable the extension in `System Settings.app`. 
+Then set it up with the following steps:
+
+1. Open the app, and click "Set Up Launch Agents" to set up a background running XPC Service that does the real job.
+2. Enable the extension in `System Settings.app`. 
 
     From the Apple menu located in the top-left corner of your screen click `System Settings`. Navigate to `Privacy & Security` then toward the bottom click `Extensions`. Click `Xcode Source Editor` and tick `Copilot`.
 
@@ -160,3 +161,7 @@ fi
 **Q: Will it work in future Xcode updates?**
 
 > A: I don't know. This extension uses many tricks to do its job, and these tricks can break in the future. 
+
+## License 
+
+MIT.