Draft on observability topics/aspects for a white paper

[sferlin]

We started discussion about a structure for a document structure (without knowing that issues #16 and #19 had similar proposals) to write a document that outlines some aspects and challenges of observability in cloud native such as:

• Definition of observability more general, e.g., the three pillars, how to use/apply it and onboard.
• What project exists in CNCF with which gaps, e.g., landscape and technology radar
• Migration channels with best practices, e.g., production experiences migrating solutions
• Issues with old patterns

[sferlin]

We are going to refer to #16 and #19 as agreed during the call.