Add tool proposal GH Issue template, and clean CONTRIBUTING and PR template

Closes #49

Author: mcguinlu

.github/ISSUE_TEMPLATE/propose_tool.md

@@ -0,0 +1,33 @@
+---
+name: Propose a new tool template
+about: Please complete this to suggest a new risk-of-bias assessment tool template for robvis
+title: ''
+labels: enhancement
+assignees: mcguinlu
+---
+
+Please complete all of the sections below to propose a new tool template.
+
+**Where is this tool published?**
+<!-- Please provide a citation, including a DOI -->
+
+**Are you the primary author/maintainer of this tool?**
+<!-- Please provide a citation, including a DOI -->
+
+**How many domains does this tool have?**
+<!-- For example, the RoB 2.0 tool has 5 domains -->
+
+**Does the tool require an overall risk-of-bias column?**
+
+**What are the domain headings/titles for this tool?**
+<!-- Please detail the title of each domain here. For example, the following are the titles of the RoB 2.0 tool domains:  
+  D1: Bias arising from the randomization process.  
+  D2: Bias due to deviations from intended intervention.  
+  D3: Bias due to missing outcome data.  
+  D4: Bias in measurement of the outcome.  
+  D5: Bias in selection of the reported result.  
+-->
+
+**What are the judgement labels for this tool?**
+<!-- What are the risk-of-bias judgement labels? For example, the labels for the RoB 2.0 tool are "Low", "Some concerns", "High"-->
+

.github/PULL_REQUEST_TEMPLATE.md

@@ -27,4 +27,4 @@
 ## **Other relevant information**:
 
 
-**Thank you for taking the time to submit this PR!**
+<!-- Thank you for taking the time to submit this PR! -->

CONTRIBUTING.md

@@ -67,7 +67,6 @@ for documentation.
 development version header describing the changes made followed by your GitHub
 username, and links to relevant issue(s)/PR(s).
 
-
 ### Additional Resources
 
   * The [Git and Github](http://r-pkgs.had.co.nz/git.html) section of the __R Packages__ book by Hadley Wickham