chore: add ldap test doc

.ci/docker-compose-file/openldap/README.md

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+# LDAP authentication
+
+To run manual tests with the default docker-compose files.
+
+Expose openldap container port by uncommenting the `ports` config in `docker-compose-ldap.yaml `
+
+To start openldap:
+
+```
+docker-compose -f ./.ci/docker-compose-file/docker-compose.yaml -f ./.ci/docker-compose-file/docker-compose-ldap.yaml up -docker
+```
+
+## LDAP database
+
+LDAP database is populated from below files:
+```
+apps/emqx_ldap/test/data/emqx.io.ldif /usr/local/etc/openldap/schema/emqx.io.ldif
+apps/emqx_ldap/test/data/emqx.schema /usr/local/etc/openldap/schema/emqx.schema
+```
+
+## Minimal EMQX config
+
+```
+authentication = [
+  {
+    backend = ldap
+    base_dn = "uid=${username},ou=testdevice,dc=emqx,dc=io"
+    filter = "(& (objectClass=mqttUser) (uid=${username}))"
+    mechanism = password_based
+    method {
+      is_superuser_attribute = isSuperuser
+      password_attribute = userPassword
+      type = hash
+    }
+    password = public
+    pool_size = 8
+    query_timeout = "5s"
+    request_timeout = "10s"
+    server = "localhost:1389"
+    username = "cn=root,dc=emqx,dc=io"
+  }
+]
+```
+
+## Example ldapsearch command
+
+```
+ldapsearch -x -H ldap://localhost:389 -D "cn=root,dc=emqx,dc=io" -W -b "uid=mqttuser0007,ou=testdevice,dc=emqx,dc=io" "(&(objectClass=mqttUser)(uid=mqttuser0007))"
+```
+
+## Example mqttx command
+
+The client password hashes are generated from their username.
+
+```
+# disabled user
+mqttx pub -t 't/1' -h localhost -p 1883 -m x -u mqttuser0006 -P mqttuser0006
+
+# enabled super-user
+mqttx pub -t 't/1' -h localhost -p 1883 -m x -u mqttuser0007 -P mqttuser0007
+```

rel/config/ee-examples/ldap-authn.conf

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+authentication = [
+  {
+    backend = ldap
+    base_dn = "uid=${username},ou=testdevice,dc=emqx,dc=io"
+    filter = "(& (objectClass=mqttUser) (uid=${username}))"
+    mechanism = password_based
+    method {
+      is_superuser_attribute = isSuperuser
+      password_attribute = userPassword
+      type = hash
+    }
+    password = public
+    pool_size = 8
+    query_timeout = "5s"
+    request_timeout = "10s"
+    server = "localhost:1389"
+    username = "cn=root,dc=emqx,dc=io"
+  }
+]