Initialize Homebrew tap

.github/workflows/main.yml

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+name: brew test-bot
+on:
+  push:
+    branches: master
+  pull_request: []
+jobs:
+  test-bot:
+    runs-on: macos-latest
+    steps:
+      - name: Set up Git repository
+        uses: actions/checkout@v2
+      - name: Run brew test-bot
+        run: |
+          set -e
+          brew update
+          HOMEBREW_TAP_DIR="/usr/local/Homebrew/Library/Taps/ojizero/homebrew-tap"
+          mkdir -p "$HOMEBREW_TAP_DIR"
+          rm -rf "$HOMEBREW_TAP_DIR"
+          ln -s "$PWD" "$HOMEBREW_TAP_DIR"
+          brew test-bot

README.md

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+# Ojizero Tap
+
+## How do I install these formulae?
+`brew install ojizero/tap/<formula>`
+
+Or `brew tap ojizero/tap` and then `brew install <formula>`.
+
+Or install via URL (which will not receive updates):
+
+```
+brew install https://raw.githubusercontent.com/ojizero/homebrew-tap/master/Formula/<formula>.rb
+```
+
+## Documentation
+`brew help`, `man brew` or check [Homebrew's documentation](https://docs.brew.sh).