Forgot to commit BCF docs

src/ifcopenshell-python/docs/bcf.rst

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+BCF
+===
+
+**BIM Collaboration Format** (BCF) is a standard by buildingSMART to manage and
+exchange coordination topics between disciplines collaborating on a project.
+For example, when there is an issue during the design, engineering, or
+construction of a project, a topic may be created, assigned, prioritised,
+commented, or linked to objects in a BIM model or camera location.
+
+There are two implementations of BCF:
+
+1. **BCF-XML**: an XML file-based exchange of collaboration topics. This is
+   useful for mass imports, exports, data migration across CDEs, or fully
+   offline implementations.
+2. **BCF-API**: an online RESTful API-based management of collaboration topics.
+   When topics are managed by a CDE, if the CDE follows the OpenCDE
+   specification by buildingSMART, their topics may be accessed and manipulated
+   using BCF.
+
+The upstream documentation by buildingSMART for BCF is available here:
+
+1. `BCF-XML 2.1 upstream documentation
+   <https://github.com/buildingSMART/BCF-XML/tree/release_2_1/Documentation>`__.
+2. `BCF-XML 3.0 upstream documentation
+   <https://github.com/BuildingSMART/BCF-XML/tree/release_3_0/Documentation>`__.
+3. `BCF-API 3.0 upstream documentation
+   <https://github.com/buildingSMART/bcf-api>`__.
+
+The IfcOpenShell **BCF** library supports BCF-XML version 2.1 and 3.0, and
+BCF-API 3.0.
+
+BCF-XML
+-------
+
+The ``bcfxml.load`` function lets you read a BCF-XML file.
+
+It takes care of using the right version based on the "bcf.version" file
+contained in the BCF package.
+
+The BCF files are extracted and parsed on-demand, and edits are stored in
+memory until you call the `save` method.
+
+.. code-block:: python
+
+    from bcf.bcfxml import load
+
+    # Load a project
+    with load("/path/to/file.bcf") as bcfxml:
+        project = bcfxml.project
+        print(project.name)
+
+        # To edit a project, just modify the object directly
+        bcfxml.project.name = "New name"
+
+        # Get a dictionary of topics
+        topics = bcfxml.topics
+
+        for topic_guid, topic_handler in bcfxml.topics.items():
+            topic = topic_handler.topic
+            print("Topic guid is", topic.guid)
+            print("Topic title is", topic.title)
+
+            # Fetch extra data about a topic
+            header = topic_handler.header
+            comments = topic_handler.comments
+            viewpoints = topic_handler.viewpoints
+
+            for comment in comments:
+                print(comment.guid)
+                print(comment.comment)
+                print(comment.author)
+
+        # Get a particular topic
+        topic = bcfxml.get_topic(guid)
+
+        # Modify a topic
+        topic.title = "New title"
+
+        bcfxml.save()
+
+BCF-API
+-------
+
+The ``bcfapi`` module lets you interact with the BCF-API standard.
+
+.. code-block:: python
+
+    from bcf.v3.bcfapi import FoundationClient, BcfClient
+
+    foundation_client = FoundationClient("YOUR_CLIENT_ID", "YOUR_CLIENT_SECRET", "OPENCDE_BASEURL")
+    auth_methods = foundation_client.get_auth_methods()
+
+    # Our library currently only implements the authorization_code flow
+    if "authorization_code" in auth_methods:
+        foundation_client.login()
+
+    bcf_client = BcfClient(foundation_client)
+
+    versions = foundation_client.get_versions()
+    for version in versions:
+    if "3.0" in versions:
+        if version["api_id"] == "bcf" and version["version_id"] == "3.0":
+            bcf_client.set_version(version)
+
+    data = bcf_client.get_projects()
+    print(data)
+    project_id = data[0]["project_id"]
+    print(project_id)
+    data = bcf_client.get_project(project_id)
+    print(data)
+    data = bcf_client.get_extensions(project_id)
+    print(data)