Implemented firestore backend

.dockerignore

@@ -1 +1,5 @@
-/node_modules
+.idea
+node_modules/
+.env
+*.db
+config.json

.gitignore

@@ -1,4 +1,5 @@
 .idea
 node_modules/
 .env
-*.db
+*.db
+config.json

README.md

@@ -10,9 +10,14 @@ Build the docker image
 docker build . --tag k-wallet
 ```
 
-Create a `.env` file as described in [#Settings], and run the docker
+Create a `config.json` file as described in [#Settings], and run the docker
 ```shell
-docker run --env-file .env k-wallet 
+docker run -v ./config.json:/app/config.json -e CONFIG_PATH=/app/config.json k-wallet
+```
+
+In case of using firestore, map the firestore key file to the desired location configured in `config.json`:
+```
+docker run -v keyfile.json:/app/firestore.json -v ./config.json:/app/config.json -e CONFIG_PATH=/app/config.json k-wallet
 ```
 
 ### Locally
@@ -27,13 +32,28 @@ npm run start
 
 ## Settings
 
-The settings are in a `.env` file, containing the follwoing:
-
-```
-DISCORD_BOT_TOKEN=<BOT_TOKEN>
-DISCORD_CLIENT_ID=<BOT_CLIENT_ID>  
-DISCORD_GUILD_ID=<GUILD_ID>        # needed for deployment
-KASPAD_ADDRESS=<ADDRESS>
-OFFLINE=no                         # In case we have problem, and want a neat message explaining things
-CUSTODIAL=<MNEMONIC>
+The settings are in a json file, e.g. `config.json`. The path is determined by the environment variable `CONFIG_PATH`.
+The file is of the following structure:
+```json
+{
+    "kaspad_address": <kaspad address>,
+    "custodial": <mnemonics for the custodial wallet>,
+
+    "storeType": <"firestore" or "keyv" (direct control)>,
+    "storeConfig": {
+        "projectId": <firestore project id>,
+        "databaseId": <database id>,
+	    "keyFilename": <path to service account key file>
+    },
+    "userStore": <connection string or collection name (for firestore) of the user store>,
+    "custodyStore": <connection string or collection name (for firestore) or the custody store>,
+
+    "offline": <use "no", "yes" or "admin" enables more debug logging directly in discord>,
+    "admin": <user ids which are allowed to see the direct logging if opted to admin>,
+    "discord_token": <bot token>,
+
+    "enableAutoForward": false,
+    "enableFaucet": false,
+    "minAllowedMulticast": 1.0
+}
 ```