Update query library README and add contributor template (#592)

- Update the `/handbook/queries` README with description, contributors section, and additional links
- Add template for contributors

handbook/queries/README.md

@@ -1,6 +1,35 @@
-# Queries
+# Standard query library
 
+Fleet's standard query library includes a growing collection of useful queries for organizations deploying Fleet and osquery.
 
-## Potentially interesting queries to consider writing up
+### Queries
 
-- 
+- [Detect machines with gatekeeper disabled](./detect-machines-with-gatekeeper-disabled.md)
+- [Detect presence of authorized SSH keys](./detect-presence-of-authorized-ssh-keys.md)
+- [Find hosts with the firewall disabled](./find-hosts-with-the-firewall-disabled.md)
+- [Get installed Chrome extensions](./get-installed-chrome-extensions.md)
+- [Get installed FreeBSD software](./get-installed-freebsd-software.md)
+- [Get installed Homebrew packages](./get-installed-homebrew-packages.md)
+- [Get installed Linux software](./get-installed-linux-software.md)
+- [Get installed macOS software](./get-installed-macos-software.md)
+- [Get installed Safari extensions](./get-installed-safari-extensions.md)
+- [Get installed Windows software](./get-installed-windows-software.md)
+- [Get laptops with failing batteries](./get-laptops-with-failing-batteries.md)
+- [Get macOS disk free space percentage](./get-macos-disk-free-space-percentage.md)
+- [Get System Logins and Logouts](./get-system-logins-and-logouts.md)
+- [Get wifi status](./get-wifi-status.md)
+- [Get Windows machines with unencrypted hard disks](./get-windows-machines-with-unencrypted-hard-disks.md)
+- [Platform info snapshot](./platform_info_snapshot.md)
+
+### Contributors
+
+Want to add your own query? 
+
+Please submit a pull request using the [Fleet standard query library template](./standard-query-library-template.md).
+
+### Additional resources
+
+Listed below are great resources that contain additional queries.
+
+- Osquery (https://github.com/osquery/osquery/tree/master/packs)
+- Palantir osquery configuration (https://github.com/palantir/osquery-configuration/tree/master/Fleet)

handbook/queries/standard-query-library-template.md

@@ -0,0 +1,25 @@
+<!-- What is your query called? Rename this markdown file with a human readable query name. -->
+
+<!-- Replace "< TODO Query title >" with your query's name. -->
+
+# < TODO Query name >
+
+<!-- Describe your query. What does information does your query reveal?  -->
+
+### Support
+
+<!-- What platforms (operating systems) support your query? -->
+
+### Query
+
+```sql
+<!-- Insert query here -->
+```
+
+### Purpose
+
+<!-- What is the goal of running your query? Ex. Information or Detection  -->
+
+### Remediation
+
+<!-- Are there any remediation steps to resolve the detection triggered by your query? If not, insert "N/A."  -->