readme for the impl

impl/README.md

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+# Server Implementation
+
+- Heavily a work-in-progress
+- Designed to be run as a single instance
+
+## Config
+
+# TOML Config File
+
+Config is managed using a [TOML](https://toml.io/en/) [file](../../config/dev.toml). There are sets of configuration values for the server
+(e.g. which port to listen on), the services (e.g. which database to use), and each service.
+
+Each service may define specific configuration, such as which DID methods are enabled for the DID service.
+
+A full config example is [provided here](../../config/kitchensink.toml).
+
+## Usage
+
+How it works:
+
+1. On startup the service loads default values into the `ServiceConfig`
+2. Checks for a TOML config file:
+   - If exists, load toml file
+   - If does not exist, it uses a default config defined in the code inline
+3. Loads the `config/.env` file and adds the env variables defined in this file to the final `ServiceConfig`
+
+## Build & Run
+
+Run:
+
+```
+docker build . -t did-dht -f build/Dockerfile
+```
+
+and then
+
+```
+docker run -p8305:8305 did-dht
+```
+
+