repo: add github issue template and basic build actions

Author: andrepuschmann

.github/ISSUE_TEMPLATE.md

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+<!--
+Before filing an issue, search for solutions here:
+- srsRAN Project discussions page (https://github.com/srsran/srsRAN_Project/discussions)
+-->
+
+## Issue Description ##
+[Describe the issue in detail]
+
+## Setup Details ##
+[Specify details of the test setup. This would help us reproduce the problem reliably]
+e.g. Network configuration, Operation System, Hardware, RF front-end, library and driver versions
+
+## Expected Behavior ##
+[What you expect to happen]
+
+## Actual Behaviour ##
+[What happens instead e.g. error message]
+
+## Steps to reproduce the problem ##
+[Tell us how to reproduce this issue e.g. RF setup, application config files]
+
+## Additional Information ##
+[Any additional information, configuration or data that might be necessary to reproduce the issue]
+

.github/workflows/ccpp.yml

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+name: C/C++ CI
+on: push
+jobs:
+  x86_ubuntu_build:
+    name: Build on x86
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-22.04, ubuntu-20.04]
+        compiler: [gcc, clang]
+    steps:
+    - uses: actions/checkout@v3
+    - name: Build srsRAN Project on x86 ${{ matrix.os }}
+      run: |
+        sudo apt update
+        sudo apt install -y cmake make gcc g++ pkg-config libfftw3-dev libmbedtls-dev libsctp-dev libyaml-cpp-dev libgtest-dev ninja-build
+        mkdir build && cd build && cmake -DENABLE_UHD=False -GNinja .. && ninja && ctest