Add the minimal code to start building BuddyPress blocks

Add 2 example blocks so that it is easy to understand how to add new ones.
Create a BP_Block class to simplify scripts and styles registration.
Only load blocks when corresponding components are active.
Set the run/build process using Parcel Bundler.
Add a WordPress code formatting script to check it.

.babelrc

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+{
+	"presets": ["@wordpress/default"]
+}

.editorconfig

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+# This file is for unifying the coding style for different editors and IDEs
+# editorconfig.org
+
+# WordPress Coding Standards
+# https://make.wordpress.org/core/handbook/coding-standards/
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = tab
+
+[*.yml]
+indent_style = space
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false
+
+[{*.txt}]
+end_of_line = crlf

.gitignore

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+# Operating system specific files
+.DS_Store
+.DS_*
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# Files and folders related to build/test tools
+node_modules
+npm-debug.log
+vendor
+.cache

build/bp-groups/bp-groups-blocks.php

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+<?php
+/**
+ * BP Groups Blocks Functions.
+ *
+ * @package   bp-blocks
+ * @subpackage \inc\bp-groups\bp-groups-blocks
+ */
+
+// Exit if accessed directly.
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
+/**
+ * Register Groups Blocks.
+ *
+ * @since 6.0.0
+ */
+function bp_groups_register_blocks() {
+	bp_register_block(
+		array(
+			'name'               => 'bp/group',
+			'editor_script'      => 'bp-group-block',
+			'editor_script_url'  => plugins_url( 'js/blocks/group.js', __FILE__ ),
+			'editor_script_deps' => array( 'wp-blocks', 'wp-element' ),
+		)
+	);
+}
+add_action( 'bp_blocks_init', 'bp_groups_register_blocks', 10 );

build/bp-groups/css/blocks/group.css

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+/* CSS for the bp/group block */