Add addin and changelog RMD template

inst/rmarkdown/templates/changelog_template/skeleton/skeleton.Rmd

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+---
+title: "[Project Name] Changelog"
+author: "Author Name"
+date: "`r Sys.Date()`"
+output: html_document
+---
+
+```{r}
+print(paste0("Last updated: ",Sys.time()))
+```
+
+------------------------------------------------------------------------
+
+# Project Introduction
+
+Write some project description
+
+------------------------------------------------------------------------
+
+YYYY-MM-DD John Doe
+
+-   Big Change 1
+-   Another Change 2 
+- 
+

inst/rmarkdown/templates/changelog_template/template.yaml

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+name: "CHANGELOG RMD"
+description: "A template to document project progress"
+create_dir: false

inst/rstudio/addins.dcf

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+Name: Peacock: Shiny Template
+Description: Shiny project with pre-defined structure and files
+Binding: init_shiny
+Interactive: true
+Params:
+  confirm: FALSE
+
+