Created Xformers (markdown)

Xformers.md

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+Xformers library is an optional way to speedup your image generation.
+
+There are not binaries for Windows except for one specific configuration, but you can build it yourself. A guide from an anonymous user:
+
+GUIDE ON HOW TO BUILD XFORMERS
+also includes how to uncuck yourself from sm86 restriction on voldy's new commit
+
+    1. go to the webui directory
+    2. source ./venv/bin/activate
+    3. cd repositories
+    3. git clone https://github.com/facebookresearch/xformers.git
+    4. cd xformers
+    5. git submodule update --init --recursive
+    6. pip install -r requirements.txt
+    7. pip install -e .
+    If you encounter some error about torch not being built with your cuda version blah blah, then try:
+    pip install setuptools==49.6.0
+
+After step 7, just wait like 30 minutes for everything to build and you're done.
+
+Then go back to modules/sd_[hijack.py](http://hijack.py/) and search for this text and delete it:
+```python
+and torch.cuda.get_device_capability(shared.device) == (8, 6)
+```