Initial Transifex configuratoin

This adds configuration for the tx client and a pointer to the project.
Later we might make use of the full Transifex/GitHub integration[1].

1. https://help.transifex.com/en/articles/6265125-github-installation-and-configuration

https://phabricator.endlessm.com/T35709

Author: dbnicholson

.tx/config

@@ -0,0 +1,8 @@
+[main]
+host = https://www.transifex.com
+
+[o:endless-os:p:godot-block-coding:r:all]
+source_file = addons/block_code/locale/godot_block_coding.pot
+source_lang = en
+file_filter = addons/block_code/locale/<lang>.po
+type = PO

addons/block_code/README.md

@@ -75,9 +75,11 @@ only work with Godot 4.4 or newer**.
 
 The gettext PO files are located in the `addons/block_code/locale` directory.
 See the Godot [documentation][godot-gettext] for instructions on working with
-PO files.
+PO files. You can also join our project on [Transifex][transifex-project] to
+collaborate with others translating the Block Coding content.
 
 [godot-gettext]: https://docs.godotengine.org/en/stable/tutorials/i18n/localization_using_gettext.html
+[transifex-project]: https://explore.transifex.com/endless-os/godot-block-coding/
 
 For developers, a few things need to be done to keep the translatable strings
 up to date.