Add change request SOP

docs/how-to-make-a-change-request.md

+# How to make a change request?
+
+## Purpose
+
+This document describes how to make a change request for the TTCN-3 standard.
+Change requests are the basis for managing changes and tracking discussions on
+the standard.
+
+When this procedure is followed correctly:
+- Change requests will contain all the necessary information.
+- Change requests will be actionable.
+- Discussions, progress and decisions on the change request will be tracked.
+
+When this procedure is not followed:
+- Change requests may be incomplete or unclear.
+- Duplicate change requests may be created.
+- Change requests might be rejected due to lack of information.
+
+
+## Procedure
+
+**Inputs:**
+- An EOL or an individual account.
+
+
+1. **[Sign in](https://labs.etsi.org/rep/users/sign_in)**: Use your EOL account
+   (same credentials as in the ETSI portal) or individual account to sign in.
+
+2. **Assure your request have not been made before:** Navigate to our [issue
+   tracker](https://labs.etsi.org/rep/mts/ttcn3/standard/-/issues/?sort=created_date&state=all&first_page_size=20#)
+   and search for issues that match to your request. Make sure you search for all
+   issues, not only the open ones. 
+   If your request has already been made, you can add a comment to the existing.
+
+3. **Open issue form**: After you made sure, that your request have not been
+   made before, open the issue form by clicking on ["New
+   issue"](https://labs.etsi.org/rep/mts/ttcn3/standard/-/issues/new).
+
+4. **Add title**: Choose a title that describes your change request concisely.
+   Some good exampleis: "Proposal: Add Rust interface", "Typo in section
+   3.2.1", "Clarify the definition of 'foo'", ...
+
+5. **Choose a description template**": Choose a template from the dropdown box
+   that fits your change request most. ![issue
+   templates](assets/issue-templates.png) The templates will help you to
+   provide the necessary information and to structure your request efficiently.  
+   You may add or remove parts of the template as needed.
+
+6. **Fill in the details**": Describe your change request. GitLab specific
+   fields like "Assignee", "Milestone", "Labels" can be left empty.  
+   If you have related or similar change requests, it is good practice to link
+   them in the description.
+
+7. **Add attachements**: If you have additional files, like a document or
+   images that describe the change request in detail, you can attach it to the
+   issue.
+
+
+**Outputs:**
+- An issue describing your change request is created.
+
+
+## FAQs
+
+**Where do I get an account?** 
+If you represent an ETSI member or ISG/SDG Participant organization, you can
+request your EOL [here](https://webapp.etsi.org/createaccount/). 
+If you don't represent any organization, you can create an Individual Account
+with your personal email address [here](https://labs.etsi.org/signup/).
+
+**Which description template should I choose for my change request?** 
+Following templates are available:  
+The _Editorial Changes_ template is used for changes that do not affect
+meaning of the standard. For example, fixing typos, grammar, or formatting.
+_Clarification Needed_ is used when the standard is unclear or ambiguous. For
+example, if a term is not defined, or if an enumeration is missing a value and
+it is unclear if this is on purpose.  
+Create a _Bug Report_ if the standard does not specify TTCN-3 as intended. For
+example, if two specifications contradict each other, or if an example does not
+reflect defined behavior.  
+A _Feature proposal_ is used to suggest new features, interfaces, documents
+or changes to existing ones.  
+You do not need to provide a full specification document, yet. It is practice
+to discuss the proposal first and create the document when the proposal is
+accepted and all details are clear.