added new benchmark issue template

.github/ISSUE_TEMPLATE/new_benchmark.md

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+---
+name: New Benchmark
+about: Describe a new benchmark to be added to the project
+title: "[New Benchmark] - title of the issue"
+labels: new benchmark
+assignees: ''
+
+---
+# To Be completed for all benchmarks
+
+## Is the new benchmark computational or experimental?
+
+- [x] Computational
+- [] Experimental
+
+## Is this a MultiTest or a normal Test?
+Specify here if the benchmark consists of only one transport run or it is a collection of input files that have the same general structure.
+
+## Give a concise description of the benchmark
+Give here a concise description of the benchmark. Include links to web pages where a longer description of the benchmark is available. Attach description documents of the
+benchmark to this issue if available.
+
+## Does the benchmark needs new types of plots?
+You can check the available plot types already implemented in JADE [here](https://jade-a-nuclear-data-libraries-vv-tool.readthedocs.io/en/latest/usage/postprocessing.html#plots-atlas). If you think that no plot can be adapted to the needs of this benchmark please provide a description (better a screenshot) of the new type of plots
+to be implemented.
+
+## Can the benchmark be used for all codes implemented in JADE or for a specific subset?
+Specify here for which codes the benchmark should be developed.
+
+## Can inputs of this benchmark be freely re-distributed?
+- [x] yes
+- [] no
+
+If no, please specificy who will be able to access the inputs.
+
+## Additional information/context
+Add here any additional information or context that you want to provide.
+
+# To be completed only for experimental benchmarks
+
+Please erase this entire block if the benchmark to be added is a computational one.
+
+## Is any of the existing general classes suitable for this benchmark?
+Some generic classes have been already developed for experimental classes of benchmarks that can be customized through excel config file. Have a look at the
+[related documentation section](https://jade-a-nuclear-data-libraries-vv-tool.readthedocs.io/en/latest/dev/insertbenchmarks.html#insert-custom-experimental-benchmark) and specify here if the new benchmark
+can use one of these classes or a new one needs to be created.
+
+## Can experimental data of this benchmark be freely re-distributed?
+- [x] yes
+- [] no
+
+If no, please specificy who will be able to access the experimental data.