docs: update contents

docs/source/about/contributing.rst

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+Contributing
+============
+
+Contributions are welcome!

docs/source/about/glossary.rst

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+Glossary
+========
+
+
+.. glossary::
+
+
+   API
+      Application Programming Interface. A set of protocols, routines, and tools for building software applications.
+
+   CRUD
+      Create, Read, Update, and Delete. A set of operations that are used to manage data in a database.
+
+   CRUD operations
+      A set of operations that are used to manage data in a database. CRUD stands for Create, Read, Update, and Delete.
+
+   CRUD operations on a database
+      Create, Read, Update, and Delete operations that are performed on a database.
+
+   CRUD operations on a relational database
+      Create, Read, Update, and Delete operations that are performed on a relational database.
+
+   CRUD operations on a NoSQL database
+      Create, Read, Update, and Delete operations that are performed on a NoSQL database.
+
+   CRUD operations on a document-oriented database
+      Create, Read, Update, and Delete operations that are performed on a document-oriented database.
+
+   CRUD operations on a graph database
+      Create, Read, Update, and Delete operations that are performed on a graph database.   
+
+   CRUD operations on a key-value store
+      Create, Read, Update, and Delete operations that are performed on a key-value store.
+
+   CRUD operations on a column-oriented database
+      Create, Read, Update, and Delete operations that are performed on a column-oriented database.
+