Added a sample project. Updated README to include a link to the Pokémon GO IV calculator as an example project.

sample-project/oxt/pkg-desc/pkg-description.txt

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+SampleProject - A Sample OpenOffice Basic Extension Project Template
+Copyright (c) 2017 imacat 
+
+A Sample OpenOffice/LibreOffice Basic extension project template.

sample-project/oxt/pkg-desc/pkg-description.zh-TW.txt

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+SampleProject - OpenOffice Basic擴充套件專案範本
+版權所有 (c) 2017 依瑪貓
+
+OpenOffice/LibreOffice Basic擴充套件專案範本。