Add homebrew installer

### Prerequisites

Please answer the following questions for yourself before submitting an issue. **YOU MAY DELETE THE PREREQUISITES SECTION.**

- [x] I am running the latest version
- [x] I checked the documentation and found no answer
- [x] I checked to make sure that this issue has not already been filed

### Problem Description
Would be great for macos to be able to do `brew install adguard-home` and it is installs itself with https://brew.sh/

### Proposed Solution
Add a homebrew formula

### Alternatives Considered
Have each user learn how to install it themselves

### Additional Information