Adds WebdavPath (#60)

* refactors _FSSpecAccessor to have explicit method passing

* unify GCSPath and S3Path implementations

* adds WebdavPath

* other port

* add webdav4 to noxfile

* windows?

* pr feedback

* add schemes to readme

* examples

* examples

* examples

Author: normanrz

README.md

@@ -20,21 +20,36 @@ conda install -c conda-forge universal_pathlib
 
 ```python
 >>> from upath import UPath
-
->>> path = UPath("file:/some/filepath.py")
->>> path.name
-filepath.py
->>> path.stem
-filepath
->>> path.suffix
-.py
->>> path.exists()
+>>> import s3fs
+
+>>> s3path = UPath("s3://test_bucket") / "example.txt"
+>>> s3path.name
+example.txt
+>>> s3path.stem
+example
+>>> s3path.suffix
+.txt
+>>> s3path.exists()
 True
+>>> s3path.read_text()
+'Hello World'
 ```
 
-Some backends may require other dependencies. For example to work with S3 paths, [`s3fs`](https://s3fs.readthedocs.io/en/latest/) is required.
-
 For more examples, see the [example notebook here](notebooks/examples.ipynb)
 
+### Currently supported filesystems (and schemes)
+
+- `file:` Local filessystem
+- `memory:` Ephemeral filesystem in RAM
+- `http:` and `https:` HTTP(S)-based filesystem
+- `hdfs:` Hadoop distributed filesystem
+- `gs:` and `gcs:` Google Cloud Storage (requires `gcsfs` to be installed)
+- `s3:` and `s3a:` AWS S3 (requires `s3fs` to be installed)
+- `webdav+http:` and `webdav+https:` WebDAV-based filesystem on top of HTTP(S) (requires `webdav4[fsspec]` to be installed)
+
+Other fsspec-compatible filesystems may also work, but are not supported and tested.
+Contributions for new filesystems are welcome!
 
+## License
 
+MIT License