Update dockerfile and add instructions

DOCKER.md

@@ -0,0 +1,32 @@
+# Running Light Client in Docker
+
+## Prerequisites
+
+- Docker
+
+## Installation
+
+1. Clone the repository:
+
+    ```bash
+    git clone https://github.com/covalenthq/das-ipfs-pinner
+    cd das-ipfs-pinner
+    ```
+
+2. Build the Docker image:
+
+    ```bash
+    docker build -t covalent/light-client -f Dockerfile.lc .
+    ```
+
+3. Run the Docker container:
+
+    ```bash
+    docker run -d --name light-client -e CLIENT_ID="YOUR UNIQUE ID" covalent/light-client
+    ```
+
+4. Check the status of the Light Client:
+
+    ```bash
+    docker logs -f light-client
+    ```