Add shape-up pitch template

.github/ISSUE_TEMPLATE/pitch-for-new-feature--by-the-shape-up-book-.md

@@ -0,0 +1,55 @@
+---
+name: Pitch for new feature (by the shape-up book)
+about: Problem, apetite, solution, drawings, rabbit holes, no-goes
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+### 1. Problem
+_What is the core problem we are trying to solve? Why does this matter?_
+
+**Describe the problem clearly and concisely.**
+
+---
+
+### 2. Appetite
+_How much time do we want to spend on this?_
+
+**Define the timebox or effort constraints (e.g., "one cycle," "two weeks," etc.).**
+
+---
+
+### 3. Solution
+_How do we imagine solving this problem?_
+
+**Provide a high-level description of the solution without going into unnecessary details.**
+
+---
+
+### 4. Basic Drawings
+_What rough sketches or wireframes illustrate the concept?_
+
+**Include diagrams, mockups, or simple text-based explanations (e.g., ASCII art, links to sketches, or embedded images).**
+
+---
+
+### 5. Rabbit Holes
+_What are the potential complexities, unknowns, or risky areas?_
+
+**List potential scope risks, technical uncertainties, or areas where deeper investigation might be needed.**
+
+---
+
+### 6. No-Goes
+_What explicitly falls outside the scope of this pitch?_
+
+**Clarify what we are deliberately avoiding to keep the project focused.**
+
+---
+
+### 7. Success Criteria
+_How will we measure success?_
+
+**Define what success looks like for this pitch (e.g., user impact, performance improvements, feature adoption).**