Add the missing build stuff

build/README.md

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+# Build helper scripts
+
+This `build/` directory contains **helper scripts and notes** for building Strawberry.
+
+- It is **not** intended to be your CMake build output directory.
+- Recommended CMake build output directories: `cmake-build/`, `build-release/`, etc.
+
+## macOS
+
+- Install dependencies via Homebrew:
+
+```bash
+./build/macos/install_brew_deps.sh
+```
+
+- Build Strawberry:
+
+```bash
+./build/macos/build_app.sh --release
+open ./cmake-build-macos-release/strawberry.app
+```
+
+## macOS signing + notarization (Developer ID distribution)
+
+This repo includes `build/macos/build_sign_notarize.sh` to automate:
+
+- build → (optional deploy) → codesign → notarize → staple → verify
+
+### One-time setup (Apple Developer)
+
+- **Install certificates**:
+  - In the Apple Developer portal, create (or download) a **Developer ID Application** certificate.
+  - Install it into your login keychain (Xcode can manage this via **Xcode → Settings → Accounts**).
+
+- **Provisioning profiles**:
+  - For **Developer ID distribution (outside the Mac App Store)**, you typically **do not need a provisioning profile**.
+  - You *do* need profiles if you are building a **Mac App Store**-signed app (not what this repo’s scripts target).
+
+- **Notarization credentials**:
+  - Create a `notarytool` keychain profile (recommended) so you don’t have to pass secrets on the command line:
+
+```bash
+xcrun notarytool store-credentials \
+  --keychain-profile "<profile-name>" \
+  --apple-id "<your-apple-id>" \
+  --team-id "<TEAMID>" \
+  --password "<app-specific-password>"
+```
+
+### Listing what’s installed locally
+
+Run with no args to list local signing identities + notarytool profiles:
+
+```bash
+./build/macos/build_sign_notarize.sh
+```
+
+### Build + sign + notarize
+
+```bash
+./build/macos/build_sign_notarize.sh --run --release --clean --deploy \
+  --identity "Developer ID Application: Your Name (TEAMID)" \
+  --notary-profile "<profile-name>"
+```