Add issue and MR templates for SLB PAWG.

.gitlab/issue_templates/SLB Builder.md

+# Builder development/change request
+
+## Motivation
+
+Outline of what is missing/wrong and a description of the changes needed.
+
+## Sketch 
+
+There can be cases where new or significantly different builders from the available codebase might be needed. If this is the case, please sketch out what kind of builder is needed for your development (_e.g._ cut variables, extra inputs etc.)
+
+## Contact(s)
+
+Author(s), listed with `@` handle.
+
+## Checklist
+
+- [ ] Assign other authors, if any.
+- [ ] When ready, review and test the latest version of the implemeneted changes against the latest version of Moore.
+- [ ] If all tests have passed **close this issue**.
+
+/assign me 
+
+/label ~"SLB Builder"

.gitlab/issue_templates/SLB New Line.md

+# Development issue for the line `LineName`
+
+<!-- Please follow the line naming convention at https://gitlab.cern.ch/lhcb/Moore/-/issues/60 -->
+
+
+## Line Name: `Hlt2LineName`
+
+## Line description
+
+Physics channel(s). Mention whether there are plans to hone the selection when porting over from Run 1/2.
+
+## Ported HLT2 & stripping lines 
+
+List the stripping & HLT2 (lines) ported. 
+
+## Contact people
+
+Author(s), listed with `@` handle.
+
+## Checklist when opening:
+
+- [ ] Milestone selected (look up the milestones starting with `SLB -` [here](https://gitlab.cern.ch/lhcb/Moore/-/milestones)).
+
+## Checklist before closing:
+
+- [ ] Assign other authors, if any.
+- [ ] MR to the `SLB` branch with report section complete.
+- [ ] Approved by reviewers.
+
+/label ~"SLB Line"
+
+/assign me

.gitlab/merge_request_templates/SLB Merge Line.md

+# Merge request for line _LineName_
+
+<!-- please follow the naming convention at https://gitlab.cern.ch/lhcb/Moore/-/issues/60 -->
+
+## Description of the line
+
+Description of channel and of the builders used in the development.
+
+## MC samples used in the development
+
+1. Minbias
+2. Channel-specific MC (report size of sample).
+
+## Contact people
+
+Use the `/assign @[name]` [gitlab quick action](https://docs.gitlab.com/ee/user/project/quick_actions.html) with the `@` handle to tag all authors.
+
+## Report
+
+- Efficiency tables obtained through the wizard.
+- Cuts that may have changed since Run 1/2.
+- Plots.
+- Any other comment.
+- Report on use of TOPO, whether in sprucing or Turbo.
+
+## Check-list
+
+- [ ] Close line-specific issue. This should be done using the [gitlab quick action](https://docs.gitlab.com/ee/user/project/quick_actions.html) `closes #[issue number]`. This will close the issue automatically when the MR is merged.
+
+/assign me
+
+/assign_reviewer @bldelane @sklaver @jugarcia
+
+/target_branch SLB