update README.md

README.md

-# com.unity.demoteam.digital-human
+# Package: com.unity.demoteam.digital-human
+
+Library of digital human tech features from *The Heretic*.
+
+
+## Requirements
+
+- Unity 2019.3.0f3 +
-Library of digital human tech features from 'The Heretic'.
+
+## Usage
+
+Declare the package as a dependency in `Packages/manifest.json`:
+
+```
+"dependencies": {
+    "com.unity.demoteam.digital-human": "https://github.com/Unity-Technologies/com.unity.demoteam.digital-human.git"
+    ...
+}
+```
+
+
+## See also
+
+https://github.com/Unity-Technologies/com.unity.demoteam.digital-human.sample