Add in-place upgrade proposal (#30)

docs/proposals/000-template.md

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+<!--
+To start a new proposal, create a copy of this template on this directory and
+fill out the sections below.
+-->
+
+# Proposal information
+
+<!-- Index number -->
+- **Index**: 000
+
+<!-- Status -->
+- **Status**: <!-- **DRAFTING**/**ACCEPTED**/**REJECTED** -->
+
+<!-- Short description for the feature -->
+- **Name**: Feature name
+
+<!-- Owner name and github handle -->
+- **Owner**: FirstName LastName / <!-- [@name](https://github.com/name) -->
+
+# Proposal Details
+
+## Summary
+<!--
+In a short paragraph, explain what the proposal is about and what problem
+it is attempting to solve.
+-->
+
+## Rationale
+<!--
+This section COULD be as short or as long as needed. In the appropriate amount
+of detail, you SHOULD explain how this proposal improves k8s providers, what is the
+problem it is trying to solve and how this makes the user experience better.
+
+You can do this by describing user scenarios, and how this feature helps them.
+You can also provide examples of how this feature may be used.
+-->
+
+## User facing changes
+<!--
+This section MUST describe any user-facing changes that this feature brings, if
+any. If an API change is required, the affected endpoints MUST be mentioned. If
+the output of any k8s command changes, the difference MUST be mentioned, with a
+clear example of "before" and "after".
+-->
+
+none
+
+## Alternative solutions
+<!--
+This section SHOULD list any possible alternative solutions that have been or
+should be considered. If required, add more details about why these alternative
+solutions were discarded.
+-->
+
+none
+
+## Out of scope
+<!--
+This section MUST reference any work that is out of scope for this proposal.
+Out of scope items are typically unknowns that we do not yet have a clear idea
+of how to solve, so we explicitly do not tackle them until we have more
+information.
+
+This section is very useful to help guide the implementation details section
+below, or serve as reference for future proposals.
+-->
+
+none
+
+# Implementation Details
+
+## API Changes
+<!--
+This section MUST mention any changes to the k8sd API, or any additional API
+endpoints (and messages) that are required for this proposal.
+
+Unless there is a particularly strong reason, it is preferable to add new v2/v3
+APIs endpoints instead of breaking the existing APIs, such that API clients are
+not affected.
+-->
+none
+
+## Bootstrap Provider Changes
+<!--
+This section MUST mention any changes to the bootstrap provider.
+-->
+none
+
+## ControlPlane Provider Changes
+<!--
+This section MUST mention any changes to the controlplane provider.
+-->
+none
+
+## Configuration Changes
+<!--
+This section MUST mention any new configuration options or service arguments
+that are introduced.
+-->
+none
+
+## Documentation Changes
+<!--
+This section MUST mention any new documentation that is required for the new
+feature. Most features are expected to come with at least a How-To and an
+Explanation page.
+
+In this section, it is useful to think about any existing pages that need to be
+updated (e.g. command outputs).
+-->
+none
+
+## Testing
+<!--
+This section MUST explain how the new feature will be tested.
+-->
+
+## Considerations for backwards compatibility
+<!--
+In this section, you MUST mention any breaking changes that are introduced by
+this feature. Some examples:
+
+- In case of deleting a database table, how do older k8sd instances handle it?
+- In case of a changed API endpoint, how do existing clients handle it?
+- etc
+-->
+
+## Implementation notes and guidelines
+<!--
+In this section, you SHOULD go into detail about how the proposal can be
+implemented. If needed, link to specific parts of the code (link against
+particular commits, not branches, such that any links remain valid going
+forward).
+
+This is useful as it allows the proposal owner to not be the person that
+implements it.
+-->