feat: Add install.sh to simplify installation

Author: yusuf-musleh

install.sh

@@ -0,0 +1,52 @@
+#!/bin/sh
+
+set -e
+
+REPO="yusuf-musleh/mmar"
+BINARY="mmar"
+
+echo "Installing $BINARY..."
+
+# Detect OS
+OS="$(uname -s)"
+case "$OS" in
+    Linux)  OS_TITLE="Linux";;
+    Darwin) OS_TITLE="Darwin";;
+    *)      echo "Unsupported OS: $OS"; exit 1;;
+esac
+
+# Detect ARCH
+ARCH="$(uname -m)"
+case "$ARCH" in
+    x86_64) ARCH_ID="x86_64";;
+    i386)   ARCH_ID="i386";;
+    aarch64|arm64) ARCH_ID="arm64";;
+    *) echo "Unsupported architecture: $ARCH"; exit 1;;
+esac
+
+ASSET="${BINARY}_${OS_TITLE}_${ARCH_ID}.tar.gz"
+URL="https://github.com/$REPO/releases/latest/download/$ASSET"
+
+# Temp dir
+TMP_DIR=$(mktemp -d)
+cd "$TMP_DIR"
+
+echo "Downloading $ASSET..."
+curl -sSL "$URL" -o "$ASSET"
+
+echo "Extracting..."
+tar -xzf "$ASSET"
+
+# Install location
+INSTALL_DIR="/usr/local/bin"
+
+# Ensure /usr/local/lib exists
+if [ ! -d "$INSTALL_DIR" ]; then
+    sudo mkdir -p "$INSTALL_DIR"
+fi
+
+echo "Installing to $INSTALL_DIR"
+sudo install -m 755 "$BINARY" "$INSTALL_DIR/$BINARY"
+
+echo "$BINARY installed successfully to $INSTALL_DIR/$BINARY"
+"$BINARY" version || true