Add migration guide.

README.md

@@ -10,6 +10,7 @@ ma1sd - Federated Matrix Identity Server
 - [Contribute](#contribute)
 - [Powered by ma1sd](#powered-by-ma1sd)
 - [FAQ](#faq)
+- [Migration from mxisd](#migration-from-mxisd)
 - [Contact](#contact)
 
 ---
@@ -108,6 +109,10 @@ The following projects can use ma1sd under the hood for some or all their featur
 # FAQ
 See the [dedicated document](docs/faq.md)
 
+# Migration from mxisd
+
+See the [migration guide](docs/migration-from-mxisd.md)
+
 # Contact
 Get in touch via:
 - Matrix: [#ma1sd:ru-matrix.org](https://matrix.to/#/#ma1sd:ru-matrix.org)

docs/getting-started.md

@@ -131,7 +131,7 @@ trusted_third_party_id_servers:
 It is **highly recommended** to remove `matrix.org` and `vector.im` (or any other default entry) from your configuration
 so only your own Identity server is authoritative for your HS.
 
-## Validate
+## Validate (Under reconstruction)
 **NOTE:** In case your homeserver has no working federation, step 5 will not happen. If step 4 took place, consider
 your installation validated.
 

docs/migration-from-mxisd.md

@@ -0,0 +1,16 @@
+# Migration from mxisd
+
+Version 2.0.0 of the ma1sd uses the same format of the database schema and main configuration file as mxisd.
+
+Migration from mxisd:
+- install ma1sd via deb package, docker image or zip/tar archive
+- stop mxisd
+- copy configuration file (by default /etc/mxisd/mxisd.yaml to /etc/ma1sd/ma1sd.yaml)
+- copy key store (by default /var/lib/mxisd/keys folder to /var/lib/ma1sd/keys)
+- copy storage (by default /var/lib/mxisd/store.db to /var/lib/ma1sd/store.db)
+- change paths in the new config file (ma1sd.yaml). There are options: `key.path` and `storage.provider.sqlite`
+- start ma1sd
+
+Due to ma1sd uses the same ports by default as mxisd it isn't necessary to change nginx/apache configuration.
+
+If you have any troubles with migration don't hesitate to ask questions in [#ma1sd:ru-matrix.org](https://matrix.to/#/#ma1sd:ru-matrix.org) room.