chore: add readme for alias and join (#10)

README.md

@@ -58,6 +58,18 @@ postgresClient.from<Message>("messages")
     .select()
     .neq(Message::content, "abc")
     .execute()
+
+// select item_id AS itemId, age from messages...
+postgresClient.from<Message>("messages")
+    .select("itemId:item_id,age")
+    .neq(Message::content, "abc")
+    .execute()
+
+// https://postgrest.org/en/stable/api.html#embedding-top-level-filter
+postgresClient.from<Message>("messages")
+    .select("name,age,company(name, address, phone)")
+    .neq(Message::content, "abc")
+    .execute()
 ```
 
 #### rpc<T>

src/main/kotlin/io/supabase/postgrest/PostgrestClient.kt

@@ -7,9 +7,9 @@ import io.supabase.postgrest.json.PostgrestJsonConverter
 import java.net.URI
 
 /**
- * Main client and entry point for using PostgREST client.
+ * Main client and entry point for using PostgresREST client.
  *
- * @param[uri] URL of the PostgREST endpoint.
+ * @param[uri] URL of the PostgresREST endpoint.
  * @param[headers] Custom headers.
  * @param[schema] Postgres schema to switch to.
  * @param[httpClient] Implementation of the [PostgrestHttpClient] interface.