Add rebalancer cmake and manifest

Summary:
Following steps here to add a new build process
https://www.internalfb.com/wiki/Open_Source/Getdeps_Build/

Using same cmakefile as github - https://github.com/facebookincubator/rebalancer/blob/richard/CMakeLists.txt

And adding a new manifest to start building this on devserver

Reviewed By: r-barnes

Differential Revision: D86833599

fbshipit-source-id: e99dc7bf3ac2f7fb5adf46b4548c7e321fa14b42

Author: sahilsd

build/fbcode_builder/manifests/rebalancer

@@ -0,0 +1,30 @@
+[manifest]
+name = rebalancer
+fbsource_path = fbcode/algopt/rebalancer/
+
+[git]
+# To git clone on devserver, setup fwdproxy:
+# https://www.internalfb.com/wiki/Open_Source/Maintain_a_FB_OSS_Project/Devserver_GitHub_Access/
+repo_url = [email protected]:facebookincubator/rebalancer.git
+branch = richard
+
+[build]
+builder = cmake
+
+[dependencies]
+boost
+folly
+gflags
+glog
+fbthrift
+fmt
+fizz
+googletest
+xxhash
+
+[cmake.defines.os=darwin]
+REBALANCER_USE_SCIP=0
+
+[shipit.pathmap]
+fbcode/algopt/rebalancer/oss = .
+fbcode/algopt/rebalancer = rebalancer