create release doc for v0.11.0 (#14)

Signed-off-by: Friedrich Gonzalez <[email protected]>

Author: friedrichg

changelogs/v0.11.0.md

@@ -0,0 +1,42 @@
+# v0.11.0 Release
+
+## Changes
+
+* [CHANGE] Rename to cortexproject/cortex-tools #2
+* [CHANGE] Update go image to v1.16.15. #4
+* [CHANGE] Upgrade cortex to v1.11.1 #5
+* [CHANGE] Match grafana/dskit with version used by cortex v1.11.1 #5
+* [CHANGE] Match prometheus/common with version used by cortex v1.11.1 #5
+* [CHANGE] Match prometheus/prometheus with version used by cortex v1.11.1 #5
+* [CHANGE] Remove loki support #7
+* [FEATURE] Support Arm64 on Darwin for all binaries (benchtool etc). #215
+* [FEATURE] Add `cortextool rules delete-namespace` command to delete the specified rule namespace. #8
+* [BUGFIX] Fix `cortextool rules` legends displaying wrong symbols for updates and deletions. #226
+
+## Installation
+
+## cortextool
+
+```console
+# download the binary (adapt os and arch as needed)
+$ curl -fSL -o "cortextool" "https://github.com/grafana/cortex-tools/releases/download/v0.11.0/cortextool_0.11.0_linux_x86_64"
+
+# make it executable
+$ chmod a+x "cortextool"
+
+# have fun :)
+$ ./cortextool --help
+```
+
+## benchtool
+
+```console
+# download the binary (adapt os and arch as needed)
+$ curl -fSL -o "benchtool" "https://github.com/grafana/cortex-tools/releases/download/v0.11.0/benchtool_0.11.0_linux_x86_64"
+
+# make it executable
+$ chmod a+x "benchtool"
+
+# have fun :)
+$ ./benchtool --help
+```