Add full documentation for image

IMAGE_README.md

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+<p align="center">
+  <img src="https://static.tumblr.com/ppdj5y9/Ae9mxmxtp/300coin.png" alt="Dogecoin" width="200"/>
+</p>
+
+# Docker images for Dogecoin
+
+## Supported tags and respective `Dockerfile` links
+
+- [`1.14.5`,`latest`](#)
+
+## Quick reference
+
+- **Maintained by the [Dogecoin community](https://github.com/dogecoin/docker/)**
+- **Docker Hub images:** https://hub.docker.com/r/dogecoin/dogecoin
+- **Dogecoin Core repository:** https://github.com/dogecoin/dogecoin
+**Issue tracker:** https://github.com/dogecoin/docker/issues
+- **Supported architectures:** `amd64`, `arm32v7`, `arm64v8`, `i386`
+
+## What is this coin with a Doge on it ?
+
+Dogecoin is a community-driven cryptocurrency that was inspired by a Shiba Inu meme. The Dogecoin Core software allows anyone to operate a node in the Dogecoin blockchain networks and uses the Scrypt hashing method for Proof of Work. It is adapted from Bitcoin Core and other cryptocurrencies.
+
+To get more information about Dogecoin Core, visit the [source code repository](https://github.com/dogecoin/dogecoin).
+
+## How to use this image
+
+Start your node in a single command, exposing P2P & RPC ports, mapping the data directory:
+```bash
+docker run -d --name dogecoin-node \
+    -v $(pwd)/datadir:/dogecoin/.dogecoin \
+    -p 22555:22555 \
+    -p 22556:22556 \
+    dogecoin/dogecoin:latest
+```
+It will launch the synchronization of the blockchain, which take hours. That's it, your node is up !
+
+To verify if the container is running and to get logs:
+```bash
+docker ps
+docker logs dogecoin-node
+```
+
+Call the JSON-RPC API using the `dogecoin-cli` present inside the container. The help menu will display all existing commands of the API:
+```bash
+docker exec dogecoin-node dogecoin-cli help
+```
+
+## Syntax & Configuration
+
+```bash
+# Syntax
+docker run  [docker-options] dogecoin/dogecoin [executable] [executable-options]
+```
+
++ `docker-options` : Set environment variables, ports, volumes and other docker settings.  
++ `executable` : Choose between `dogecoind`, `dogecoin-cli`, `dogecoin-tx` or `dogecoin-qt`. Default to `dogecoind`.  
++ `executable-options` : Pass options directly to the executable.
+
+There are three ways to configure the Dogecoin node:
+
+1. by using environment variables,
+2. by passing arguments to the executable,
+3. by providing a `dogecoin.conf` in a volume.
+
+**To see all available configurations, see the `-help` menu from each executable:**
+```bash
+docker run dogecoin/dogecoin -help
+```
+
+### Configure with executable arguments
+
+`docker run` arguments are passed directly to the executable.
+```bash
+docker run dogecoin/dogecoin -paytxfee=0.01 -testnet
+```
+
+### Configure with environment variables
+
+All options, for each executable, can be defined with environment variables.
+
+```bash
+docker run -e PAYTXFEE=0.01 -e TESTNET=1 dogecoin/dogecoin
+```
+Environment variables represent executable arguments converted into upper case, without leading hyphen (`-`). 
+Any hyphens inside an argument name must be converted to underscores (from `-`, to `_`.) 
+Note that boolean arguments require the value `1` assigned to the variable.
+
+For example, the `-help-debug` argument becomes `HELP_DEBUG=1` as environment variable.
+
+### Configure with a configuration file
+
+`dogecoin.conf` file can be used to configure your node. This file need to be located in the `datadir` of the node.
+
+Create `dogecoin.conf` with the following content:
+```
+testnet=1
+paytxfee=0.01
+```
+
+Put this file in the directory mounted to `/dogecoin/.dogecoin`, in `datadir` for this example :
+```bash
+docker run -v $(pwd)/datadir:/dogecoin/.dogecoin dogecoin/dogecoin
+```
+
+### Docker Compose
+
+Example for `docker-compose.yml` :
+```
+version: '3.1'
+
+services:
+  dogecoin:
+    image: dogecoin/dogecoin
+    restart: always
+    environment:
+      PAYTXFEE: 0.01
+      MAXCONNECTIONS: 150
+    ports:
+      - 22555:22555
+      - 22556:22556
+    volumes:
+      - ./datadir:/dogecoin/.dogecoin
+```
+Then, run `docker compose up`.
+
+## License
+
+Docker repository for Dogecoin Core is released under [MIT license](https://github.com/dogecoin/docker/blob/main/LICENSE).
+Feel free to use, modify & distribute for commercial and non-commercial purpose.
+
+Please share your improvements & fixes to improve the tool for everyone :)