Add Category Proposal issue template

.github/ISSUE_TEMPLATE/Category_Proposal.md

@@ -0,0 +1,35 @@
+---
+name: Category Proposal
+about: For proposing and discussing a change to the list of categories available under the Elastic Package Specification
+labels: discuss
+title: "[Category Proposal] "
+---
+
+*Please read the section on [Category Proposals in the Contributing Guide](../../CONTRIBUTING.md#category-proposals) and flesh out this issue accordingly. Thank you!*
+
+## Context
+
+<!-- Provide some background context on why this new category is needed. -->
+
+## Eligibility Requirements
+
+Please, address the following to make sure the propsal is elegible:
+
+- [ ] New category must group at least 5 integrations, existing or planned. List them here.
+- [ ] Alternative existing categories in which these integrations are (currently) or could be (in the future) grouped.
+- [ ] Proof that this label is a well-known industry term and not jargon used by a few.
+  - Usage of the keyword in Gartner or Forrester industry reports.
+  - Industry blogs using this label or keyword.
+  - Customer mentioning this keyword.
+- [ ] Proof that users use this label to describe this subset of integrations.
+  - Enhancement requests that complain about the lack of this category.
+  - Full-story data reporting on average 50+ unique searches for this keyword per month in the integrations UI.
+  - Usage of this category for filtering purposes by our industry.
+- [ ] Impact that are we expecting with this category and how we will measure it (success criteria)
+
+## Implementation checklist
+
+- [ ] Support in package-spec manifest categories
+- [ ] Support in package-registry /categories API
+- [ ] Support in Fleet
+- [ ] Update integrations dependencies to support new category

CONTRIBUTING.md

@@ -29,6 +29,20 @@ something like this:
 5. No single PR may close the proposal issue. But as these PRs get resolved, the corresponding checklist item should be 
    checked off. The proposal issue is closed when all items are checked off.
 
+## Category Proposals
+
+Any changes on the categories supported by the Elastic Package Specification has to be discussed. The process is:
+
+1. A solutions team or an integration author creates a
+[Category Proposal issue](https://github.com/elastic/package-spec/issues/new/choose)
+in the package-spec repo requesting the addition of a new category.
+2. Github issue provides details related to the category i.e. label, position, solution, etc. Answers to all the points in
+the eligibility requirement and a plan or timeline to add a promised minimum set of integrations.
+3. Ecosystem team assesses the request and makes a decision based on data points provided in the GitHub issue
+4. If we are not able to address and the category doesn’t meet eligibility requirements, we can assume that
+this category is more harmful to the UX than the value it provides, and hence, it must not be added.
+5. If the decision is in favor of adding the category, the Ecosystem team will prioritize and work on the GitHub issue in
+one of the releases under planning (future releases)
 
 ## Folder Item spec