Added README.md template

docker/README.md

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+# BlockScout Docker integration
+
+For now this integration is not production ready. It made only for local usage only !
+
+## How to use ?
+
+## Env variables
+
+BlockScout support 3 different JSON RPC Variants.
+Vriant could be configured using `ETHEREUM_JSONRPC_VARIANT` environment variable.
+
+Example: 
+```bash
+ETHEREUM_JSONRPC_VARIANT=ganache make start
+```
+
+Available options are:
+
+ * `parity` - Parity JSON RPC (**Default one**)
+ * `geth` - Geth JSON RPC
+ * `ganache` - Ganache JSON RPC
+ 
+
+| Variable | Description | Default value |
+| -------- | ----------- | ------------- |
+| `ETHEREUM_JSONRPC_VARIANT` | Variant of your JSON RPC service: `parity`, `geth` or `ganache` | `parity` |
+| `ETHEREUM_JSONRPC_HTTP_URL` | HTTP JSON RPC URL Only for `geth` or `ganache` variant | `http://localhost:7545` |
+| `ETHEREUM_JSONRPC_WEB_SOCKET_URL` | WS JSON RPC url **Only for `geth` or `ganache` variant** | `ws://localhost:7545` |
+