Improved readability of readme (#628)

* Add app store download banner

Signed-off-by: Yusuke Arakawa <nekolaboratory@users.noreply.github.com>

* Improve command readability

Signed-off-by: Yusuke Arakawa <nekolaboratory@users.noreply.github.com>

---------

Signed-off-by: Yusuke Arakawa <nekolaboratory@users.noreply.github.com>
Co-authored-by: Yusuke Arakawa <nekolaboratory@users.noreply.github.com>

Images/download_on_the_app_store.svg

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README.md

@@ -1,6 +1,6 @@
 # IceCubesApp
 
-[You can now download it on the App Store](https://apps.apple.com/us/app/ice-cubes-for-mastodon/id6444915884)
+[![Download on the App Store](Images/download_on_the_app_store.svg)](https://apps.apple.com/us/app/ice-cubes-for-mastodon/id6444915884)
 
 
 <img src="Images/promo.png" />
@@ -29,6 +29,10 @@ Here are the steps:
 
 1. Clone the repo
 2. In the same folder that contains the `IceCubesApp.xcconfig.template`, run this command:
- - cp IceCubesApp.xcconfig.template IceCubesApp.xcconfig
+
+```
+cp IceCubesApp.xcconfig.template IceCubesApp.xcconfig
+```
+
 3. Fill in the `DEVELOPMENT_TEAM` and `BUNDLE_ID_PREFIX` values. The first should have your Apple Team ID (which you can find by logging into the Apple Developer Portal). The latter is your domain in reverse notation or whatever you use as the prefix for your projects.
 4. Save your changes, and then you should be able to compile the project without any issues.