chore: add request dashboard issue template

.github/ISSUE_TEMPLATE/request_dashboard.md

@@ -0,0 +1,58 @@
+---
+name: Request Dashboard
+about: Request a new dashboard for the SigNoz Dashboards repository
+title: ''
+labels: 'dashboard-template'
+assignees: ''
+
+---
+
+## 📝 Dashboard Request Template
+
+*Use this template to request a new dashboard for the SigNoz Dashboards repository. Please provide as much detail as possible to help us understand your needs.*
+
+---
+
+### 1. Dashboard Name
+
+Name of the requested dashboard (e.g., MySQL Monitoring Dashboard):
+
+---
+
+### 2. Expected Dashboard Sections and Panels
+
+#### Section Name
+
+Brief description of the section (e.g., "Resource usage metrics for MySQL database").
+
+#### Panel Name
+
+Panel description (e.g., "Value-type panels displaying current CPU usage, memory usage, etc.").
+
+- **Example:**
+  - **Section**: Resource Metrics
+    - **Panel**: CPU Usage - Displays the current CPU usage across all database instances.
+    - **Panel**: Memory Usage - Displays the total memory used by the MySQL process.
+
+(Repeat this format for additional sections and panels)
+
+---
+
+### 3. Expected Variables
+
+List any variables you expect to use in the dashboard (e.g., `deployment.environment`, `hostname`, etc.).
+
+---
+
+### 4. Additional Comments or Requirements
+
+Any additional details or special requirements for the dashboard?
+
+---
+
+### 📋 Notes
+
+Please review the [CONTRIBUTING.md](https://github.com/SigNoz/dashboards/blob/main/CONTRIBUTING.md) for guidelines on dashboard structure, naming conventions, and how to submit a pull request.
+
+---
+Thank you for your request! We will review it and provide feedback or guidance as necessary.