Add GitHub workflow closing newly opened issues and default issue tem…

…plate (#15)

* Add workflow closing newly opened issues

* Add default issue template

.github/ISSUE_TEMPLATE/please--open-new-issues-in-membranefranework-membrane_core.md

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+---
+name: Please, open new issues in membranefranework/membrane_core
+about: New issues related to this repo should be opened there
+title: "[DO NOT OPEN]"
+labels: ''
+assignees: ''
+
+---
+
+Please, do not open this issue here. Open it in the [membrane_core](https://github.com/membraneframework/membrane_core) repository instead.
+
+Thanks for helping us grow :)

.github/workflows/on_issue_opened.yaml

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+name: 'Close issue when opened'
+on:
+  issues:
+    types:
+      - opened
+jobs:
+  close:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout membrane_core
+      uses: actions/checkout@v3
+      with:
+        repository: membraneframework/membrane_core
+    - name: Create label if it not exists
+      uses: ./.github/actions/create_label
+      with:
+        GITHUB_TOKEN: ${{ secrets.MEMBRANEFRAMEWORKADMIN_TOKEN }}
+    - name: Close issue 
+      uses: ./.github/actions/close_issue
+      with:
+        GITHUB_TOKEN: ${{ secrets.MEMBRANEFRAMEWORKADMIN_TOKEN }}
+        ISSUE_URL: ${{ github.event.issue.html_url }}
+        ISSUE_NUMBER: ${{ github.event.issue.number }}
+        REPOSITORY: ${{ github.repository }}