Added CHANGELOG.md.

CHANGELOG.md

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+# CHANGELOG :airplane:
+
+The following is a history of the changes made to this project.
+
+## The "web" branch.
+
+* Script halts if prerequisite packages are not installed within 5 attempts.
+* The piaware_builder source is now ran from the v2.1-3 tag.
+* Renamed the collectd folder to graphs.
+* Added navigation header to the Dump1090 map.
+* Added adsbexchange-maint.sh to this repository.
+* Performance graph cron jobs moved to file located in /etc/cron.d.
+* Can share data to ADS-B Exchange without PiAware installed.
+* Plane Finder ADS-B Client package now installs on Debian x86_64.
+* Plane Finder ADS-B Client package now installs on Ubuntu x86_64.