Create "SIG PM representatives.md" (#453)

* Create SIG PM representatives.md

* Updated with the latest data

Author: idvoretskyi

Diff for: sig-pm/SIG PM representatives.md

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+|  **SIG** | **Name** | **GitHub ID** | **e-mail** | **Secondary** |
+|  ------ | ------ | ------ | ------ | ------ |
+|  API machinery | William Denniss |  | [email protected] |  |
+|  Apps | Dan Paik, Antoine Legrand | danpaik; ant31 | [email protected] | [email protected] |
+|  Auth | CJ Cullen | cjcullen | [email protected] |  |
+|  Autoscaling | Solly Ross | directxman12 | [email protected] |  |
+|  AWS | Justin Santa Barbara | justinsb |  |  |
+|  CLI | Joe Beda | jbeda | [email protected] |  |
+|  Cluster Lifecycle | Dan Gillespie | ethernetdan | [email protected] |  |
+|  Cluster Ops | Jason Singer DuMars | jdumars | [email protected] | Rob Hirschfeld |
+|  Contrib Experience | Garrett Rodrigues | grodrigues3 | [email protected] |  |
+|  Docs | N/A |  |  |  |
+|  Federation | David Aronchick |  | [email protected] |  |
+|  Instrumentation | Piotr Szczesniak | piosz | [email protected] | Patrick Christopher ([email protected]) |
+|  Network |  |  |  |  |
+|  Node | Caleb Miles | calebamiles | [email protected] |  |
+|  On-Premises | Tomasz Napierala | zen | [email protected] |  |
+|  OpenStack | Ihor Dvoretskyi | idvoretskyi | [email protected] |  |
+|  rktnetes | Covered by SIG-Node |  |  |  |
+|  Scalability | Bob Wise | countspongebob | [email protected] | [email protected] |
+|  Scheduling | Tim St. Clair | timothysc | [email protected] | David Oppenheimer (@davidopp) |
+|  Service catalog | Doug Davis | duglin | [email protected] |  |
+|  Storage | Matthew DeLio | mdelio | [email protected] | Saad Ali (@saad-ali) |
+|  Testing | N/A |  |  |  |
+|  UI | Dan Romlein | danielromlein | [email protected] |  |
+|  Windows | Michael Michael | michmike | [email protected] |  |