Add license and generator script

LICENSE.txt

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+Font Awesome Free License
+-------------------------
+
+Font Awesome Free is free, open source, and GPL friendly. You can use it for
+commercial projects, open source projects, or really almost whatever you want.
+Full Font Awesome Free license: https://fontawesome.com/license/free.
+
+# Icons: CC BY 4.0 License (https://creativecommons.org/licenses/by/4.0/)
+In the Font Awesome Free download, the CC BY 4.0 license applies to all icons
+packaged as SVG and JS file types.
+
+# Fonts: SIL OFL 1.1 License (https://scripts.sil.org/OFL)
+In the Font Awesome Free download, the SIL OLF license applies to all icons
+packaged as web and desktop font files.
+
+# Code: MIT License (https://opensource.org/licenses/MIT)
+In the Font Awesome Free download, the MIT license applies to all non-font and
+non-icon files.
+
+# Attribution
+Attribution is required by MIT, SIL OLF, and CC BY licenses. Downloaded Font
+Awesome Free files already contain embedded comments with sufficient
+attribution, so you shouldn't need to do anything additional when using these
+files normally.
+
+We've kept attribution comments terse, so we ask that you do not actively work
+to remove them from files, especially code. They're a great way for folks to
+learn about Font Awesome.
+
+# Brand Icons
+All brand icons are trademarks of their respective owners. The use of these
+trademarks does not indicate endorsement of the trademark holder by Font
+Awesome, nor vice versa. **Please do not use brand logos for any purpose except
+to represent the company, product, or service to which they refer.**

generate.py

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+import os
+
+def make_file(directory, name, out):
+    out.write('<ha-iconset-svg name="{}" size="512"><svg><defs>\n'.format(name))
+    for f in os.listdir(directory):
+        with open(os.path.join(directory, f), 'r') as fp:
+            name = os.path.splitext(f)[0]
+            data = fp.read()
+            start = data.find('<path')
+            out.write('<g id="{}">'.format(name) + data[start:-6] + '</g>\n')
+    out.write('</defs></svg></ha-iconset-svg>')
+
+# Run this in Font-Awesome/advanced-options/raw-svg/
+
+# with open("hass-fontawesome-brands.html", 'w') as out:
+#     make_file('brands', 'fab', out)
+# with open("hass-fontawesome-regular.html", 'w') as out:
+#     make_file('regular', 'far', out)
+# with open("hass-fontawesome-solid.html", 'w') as out:
+#     make_file('solid', 'fas', out)