Add ONVIF quick camera tool and demo script

Dockerfile

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+# Multi-stage build for Go ONVIF library
+FROM golang:1.21-alpine AS builder
+
+# Install build dependencies
+RUN apk add --no-cache git ca-certificates tzdata
+
+# Set working directory
+WORKDIR /src
+
+# Copy go mod files
+COPY go.mod go.sum ./
+
+# Download dependencies
+RUN go mod download
+
+# Copy source code
+COPY . .
+
+# Build the applications
+RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o /bin/onvif-cli ./cmd/onvif-cli
+RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o /bin/onvif-quick ./cmd/onvif-quick
+
+# Final stage
+FROM alpine:latest
+
+# Install runtime dependencies
+RUN apk --no-cache add ca-certificates tzdata
+
+# Create non-root user
+RUN addgroup -g 1001 -S onvif && \
+    adduser -u 1001 -S onvif -G onvif
+
+# Set working directory
+WORKDIR /app
+
+# Copy binaries from builder
+COPY --from=builder /bin/onvif-cli /usr/local/bin/
+COPY --from=builder /bin/onvif-quick /usr/local/bin/
+
+# Copy examples (optional)
+COPY --from=builder /src/examples ./examples/
+
+# Set ownership
+RUN chown -R onvif:onvif /app
+
+# Switch to non-root user
+USER onvif
+
+# Default command (run the quick tool)
+CMD ["onvif-quick"]
+
+# Labels
+LABEL maintainer="ONVIF Library Team"
+LABEL description="Go ONVIF library with CLI tools"
+LABEL version="1.0.0"