Add initial testing code

README.md

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+# Sass Testing
+```powershell
+npm install -g sass
+sass input/:output/
+```

input/style.scss

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+body {
+    width: 100%;
+    p {
+        color: red;
+    }
+}

output/style.css

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+body {
+  width: 100%;
+}
+body p {
+  color: red;
+}
+
+/*# sourceMappingURL=style.css.map */

output/style.css.map

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+{"version":3,"sourceRoot":"","sources":["../input/style.scss"],"names":[],"mappings":"AAAA;EACI;;AACA;EACI","file":"style.css"}