Add PR template for new libraries

Author: rubensworks

./PULL_REQUEST_TEMPLATE/New_lib.md

@@ -0,0 +1,20 @@
+---
+name: "➕ Add library MYLIB"
+about: Suggest an entry to the list of libraries
+
+---
+
+<!--Thanks for your PR! Please fill in the following template and fill in your library name in the PR title.-->
+
+To improve the usability of RDFJS tools,
+we recommend all listed libraries to have the following elements in their documentation (README or linked).
+Please select all elements that apply for your library:
+
+* [ ] General description: High-level description of tool and available features.
+* [ ] Installation: How to install and import into project.
+* [ ] Usage: Describing the main features with code examples.
+* [ ] Configuration: The available config options for this tool, e.g. constructor params.
+* [ ] Specification Compliance: Mention the compliance with respect to any (W3C) specification, including RDFJS interfaces.
+* [ ] License: The license under which the library is available.
+
+Feel free to reuse our [README template](https://.com/rdfjs/lib-template/blob/master/README.md) for this.