Added admission policy

docs/POLICY_ADMISSIONS.md

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+If you are interested in becoming a member of the Inclusivity Working Group, please [submit your application here](https://nebrius.typeform.com/to/dsvEs5).
+
+# Process Notes
+
+- Submissions are anonymous, only members of the inclusivity WG can see the responses.
+- Submissions are discussed privately by current members of the Inclusivity WG.
+- Applicants will receive either an acceptance or rejection message via their supplied email.
+    - The results are not made public by the WG.
+    - Applicants are free to make the response public, if so desired.
+- Once accepted, new members will be:
+    - Publicly listed on GitHub, and have voting rights in all Working Group matters.
+    - Added as a collaborator to the repository.
+    - Invited to the Slack channel*.
+
+* Although Slack is a private communication system, the Inclusivity Working Group makes the contents of the Slack team public after a period of time. See [CONTRIBUTING.md](CONTRIBUTING.md) for more information.
+
+# Voting criteria
+
+Applications will be considered using the following criteria:
+
+- Does the applicant have a reasonable understanding of inclusivity and diversity?
+- Does the applicant seem sincere in their application, i.e. not a troll?
+- Does the applicant bring a new perspective to the Inclusivity Working Group?
+
+# Response steps:
+
+- The application is discussed as a group on Slack to try and arrive at a consensus. It is not a blind vote without discussion first.
+- Once a decision is ready to be made, a vote is taken by the WG members. This is the official selection process, with the vote result being binding.
+    - Applicants are approved by unanimous vote only.
+- If accepted, an invitation to the Slack is sent, the applicant is added as a collaborator to the GitHub repository, and their name is added to the official list of members.
+- If the candidate is rejected, a document is drafted summarising the reasons for rejection. This should related clearly back to the voting criteria above. This document is sent to the email they supplied in the Typeform.