Add regression checklist template (#589)

Author: ladisgin

.github/ISSUE_TEMPLATE/regression_checklist.md

@@ -0,0 +1,50 @@
+---
+name: Regression checklist
+about: Checklist for smoke testing of release build
+title: ''
+labels: qa
+assignees: ''
+---
+
+Get build from this run - https://github.com/UnitTestBot/UTBotCpp/actions/workflows/publish-utbot.yml
+
+Setup dedicated server according to following manual - https://github.com/UnitTestBot/UTBotCpp/wiki/install-server
+Setup local server according to following manual - https://github.com/UnitTestBot/UTBotCpp/wiki/docker-free-wsl2
+
+_**Delete project folders with sample project on remote and local server if they are left from previous test runs.**_
+
+VSCode:
+- [ ] Install plugin (`Ctrl-Shift-P` - `Extensions: Install plugin from VSIX`)
+- [ ] Verify version on plugin page (`Ctrl-Shift-X` search for `@installed unittestbot`)
+
+- [ ] Open folder with unpacked attached sample project - UnitTestBot Wizard should be started
+- [ ] SFTP and Sarif Viewer plugins are marked as installed on first page of the Wizard
+- [ ] On Server configuration check that both local and server connection could be established.
+- [ ] When cannot connect proper error should be shown
+- [ ] Connect to remote server and complete the wizard - build folder created, project configured
+
+
+- [ ] Open `lib\calc.c` file, generate tests for `div(int a, int b)` function - tests are generated, Sarif report is opened
+- [ ] Run only one test - `regression` tests pass, `error` tests fails, coverage shown in `calc.c` file.
+- [ ] Run all generated tests in test file - `regression` tests pass, `error` tests fails, coverage shown in `calc.c` file.
+
+
+- [ ] Generate and run tests for items listed below. Before the test remove `tests` folder. After test verify proper number of tests files appeared and run one of them.
+    - [ ] File `lib\str_utils.c`
+    - [ ] Folder `src`
+    - [ ] Project
+
+- [ ] Verbose
+    - [ ] On
+    - [ ] Off
+
+- [ ] Log windows (writing to log could be unstable - see #430)
+    - [ ] UTBot: Client Log
+    - [ ] UTBot: Server Log
+    - [ ] UTBot: Test console
+
+- [ ]  Open UTBot Explorer (at left pane)
+- [ ] [Target window](https://github.com/UnitTestBot/UTBotCpp/wiki/targets)
+- [ ] Source Code window
+
+- [ ] CLion plugin - do simple test - install plugin - configure to work with local server generate and run some test. Additionally verifying that coverage is generated.