feat: add testimonial issue template and README badge

Author: sharon77242

.github/ISSUE_TEMPLATE/testimonial.yml

@@ -0,0 +1,71 @@
+name: "Share what Argus found"
+description: "Found a bug or performance issue in your codebase? Tell us about it."
+title: "[Found] "
+labels: ["testimonial"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for sharing! One specific finding helps others understand what Argus catches in real codebases.
+        If you prefer, you can also post in the [GitHub Discussion](https://github.com/sharon77242/Argus/discussions).
+
+  - type: textarea
+    id: what-was-caught
+    attributes:
+      label: What did Argus catch?
+      description: Paste the relevant agent output or describe the specific issue it detected.
+      placeholder: |
+        [QUERY] SELECT * FROM orders WHERE user_id = $1 — 23 executions in 0.9s
+        ↳ n-plus-one: Same query from orders.service.ts:41 fired 23 times in one request.
+    validations:
+      required: true
+
+  - type: dropdown
+    id: issue-type
+    attributes:
+      label: Type of issue found
+      options:
+        - N+1 query
+        - Memory leak
+        - Event loop lag
+        - Slow query
+        - Unparameterized query
+        - SELECT * on hot path
+        - Other
+    validations:
+      required: true
+
+  - type: dropdown
+    id: db-driver
+    attributes:
+      label: Database / driver
+      options:
+        - PostgreSQL (pg)
+        - MySQL (mysql2)
+        - MongoDB (mongodb)
+        - Redis (ioredis / redis)
+        - Prisma
+        - TypeORM
+        - Sequelize
+        - Mongoose
+        - SQLite
+        - Other / multiple
+    validations:
+      required: true
+
+  - type: input
+    id: app-type
+    attributes:
+      label: App framework
+      placeholder: "e.g. Express, NestJS, Fastify"
+    validations:
+      required: false
+
+  - type: textarea
+    id: impact
+    attributes:
+      label: Did it change anything? (optional)
+      description: Fixed the issue, understood the root cause, still investigating — anything is fine.
+      placeholder: "We batched the query and cut response time from 2.1s to 80ms."
+    validations:
+      required: false

README.md

@@ -7,6 +7,7 @@
 [![npm version](https://badge.fury.io/js/argus-apm.svg)](https://badge.fury.io/js/argus-apm)
 [![npm downloads](https://img.shields.io/npm/dm/argus-apm.svg)](https://www.npmjs.com/package/argus-apm)
 [![License](https://img.shields.io/badge/License-Apache_2.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
+[![Share what you found](https://img.shields.io/badge/Share%20what%20you%20found-%F0%9F%90%9B-brightgreen)](https://github.com/sharon77242/Argus/discussions)
 
 > Minimum Node 14.18 as a compiled package · Node 22.6 for source/dev mode