Adding Docker recipe and instructions

Dockerfile

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+# Use Mambaforge as base - it's optimized for conda-forge and bioconda
+FROM condaforge/mambaforge:latest
+
+RUN apt-get update \
+    && DEBIAN_FRONTEND=noninteractive apt-get install --no-install-recommends -y \
+        build-essential \
+        git \
+        wget \
+		unzip \
+    && rm -rf /var/lib/apt/lists/* \
+    && apt-get autoremove -y \
+    && apt-get clean
+
+# Prevent conda from activating the base environment
+ENV CONDA_AUTO_ACTIVATE_BASE=false
+
+# Install DROP using mamba
+# Combining commands to reduce layers and cleanup to reduce image size
+RUN mamba create -n drop_env -c conda-forge -c bioconda drop \
+    bioconda::bioconductor-bsgenome.hsapiens.ucsc.hg38 \
+    bioconda::bioconductor-bsgenome.hsapiens.ucsc.hg19 \
+    --override-channels -y && \
+    mamba clean -afy && \
+    find /opt/conda/ -follow -type f -name '*.a' -delete && \
+    find /opt/conda/ -follow -type f -name '*.pyc' -delete && \
+    find /opt/conda/ -follow -type f -name '*.js.map' -delete
+
+# Set up the environment activation script
+RUN echo '. /opt/conda/etc/profile.d/conda.sh && conda activate drop_env' >> /.bashrc && \
+    echo '. /opt/conda/etc/profile.d/conda.sh && conda activate drop_env' >> /.profile
+
+# Make sure the conda environment is activated for any command
+ENV PATH /opt/conda/envs/drop_env/bin:$PATH

container_info.md

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+# Using the containerised version of DROP
+The prebuilt container is available here: https://quay.io/repository/sarahbeecroft9/drop
+
+In the example, let's use the Singularity container engine.
+
+Getting the container from the repo onto your machine:
+`singularity pull docker pull quay.io/sarahbeecroft9/drop`
+This will create a file called drop_latest.sif
+
+## some examples
+Here, the my_drop_analysis_dir is the directory you wish to read/write your drop results into/out of. You can also specify the full path as opposed to the relative path used in these examples. It is important to use the `-B my_drop_analysis_dir:/home/ubuntu` flag, which will bind-mount your local analysis directory to the home directory in the container. 
+
+### Example 1A: Run `drop demo` in `my_drop_analysis_dir`
+`singularity exec -B my_drop_analysis_dir:/home/ubuntu drop.sif drop demo`
+
+### Example 1B: Run snakemake pipeline in `my_drop_analysis_dir`
+`singularity exec -B my_drop_analysis_dir:/home/ubuntu drop.sif snakemake -c 10`
+
+### Example 2A: Run `drop init` in `my_drop_analysis_dir`
+`singularity exec -B my_drop_analysis_dir:/home/ubuntu drop.sif drop init`
+
+### Example 2B: Run snakemake pipeline in `my_drop_analysis_dir`
+`singularity exec -B my_drop_analysis_dir:/home/ubuntu drop.sif snakemake -c 10`