Add build/install scripts

scripts/install.sh

@@ -0,0 +1,51 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+PREFIX="${PREFIX:-/usr/local/imap}"
+
+usage() {
+  cat <<USAGE
+Usage: $0
+
+Environment:
+  PREFIX    (default: /usr/local/imap)
+
+Installs:
+  - headers to: \$PREFIX/include
+  - static lib to: \$PREFIX/lib/libc-client.a
+
+Note:
+  Requires a successful build (c-client/c-client.a exists).
+USAGE
+}
+
+if [[ "${1:-}" == "-h" || "${1:-}" == "--help" ]]; then
+  usage
+  exit 0
+fi
+
+cd "$ROOT"
+
+SRC_LIB="${ROOT}/c-client/c-client.a"
+SRC_HDR_DIR="${ROOT}/c-client"
+
+if [[ ! -f "$SRC_LIB" ]]; then
+  echo "ERROR: $SRC_LIB not found. Build first (./scripts/build.sh)." >&2
+  exit 1
+fi
+
+echo "==> Installing to PREFIX=$PREFIX"
+install -d -m 0755 "$PREFIX/include" "$PREFIX/lib"
+
+echo "==> Installing headers"
+# Only install the public headers (all .h in c-client/)
+install -m 0644 "$SRC_HDR_DIR"/*.h "$PREFIX/include/"
+
+echo "==> Installing libc-client.a"
+install -m 0644 "$SRC_LIB" "$PREFIX/lib/libc-client.a"
+
+echo "==> Done."
+echo "Installed:"
+echo "  Headers:  $PREFIX/include/*.h"
+echo "  Library:  $PREFIX/lib/libc-client.a"