add documentation

unmaintained/tor/README.md

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+## wonderfall/tor
+
+![](https://upload.wikimedia.org/wikipedia/commons/thumb/1/15/Tor-logo-2011-flat.svg/612px-Tor-logo-2011-flat.svg.png)
+
+#### Features
+- Based on Alpine Linux.
+- Tor built from source.
+- ARM included, allowing real-time monitoring.
+
+#### Usages
+- As a relay ([french article](https://wonderfall.xyz/un-relais-tor-avec-docker/)).
+- As a hidden service dir.
+
+### Build-time variables
+- **TOR_VERSION** : version of Tor.
+- **TOR_USER_ID** : tor user id *(default : 45553)*
+- **ARM_VERSION** : version of ARM
+- **GPG_** : fingerprints of signing keys
+
+#### Environment variables
+- **TERM** = xterm (ARM requirement)
+- **UID** = tor user id
+- **GID** = tor group id
+
+#### Volumes
+- **/tor/config** : tor configuration files.
+- **/tor/data** : tor data.
+
+#### Ports
+- **9001** (bind it) : ORPort.
+- **9030** (bind it) : DirPort.