Created CircleCI (asciidoc)

CircleCI.asciidoc

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+=== Building Nim projects on Circle CI
+
+Building your code on Circle CI is useful to check regressions against the master and devel branches of Nim.
+Same for your code documentation.
+
+Configure the build:
+
+Under Test Commands >> Dependency Commands >> Pre-dependency commands:
+[source,sh]
+----
+wget http://http.us.debian.org/debian/pool/main/n/nim/nim_0.16.0-1_amd64.deb
+wget http://http.us.debian.org/debian/pool/main/o/openssl1.0/libssl1.0.2_1.0.2j-4_amd64.deb
+sudo dpkg -i *_amd64.deb
+----
+
+Under Test Commands >> Test Commands >> Test Commands:
+[source,sh]
+----
+# This will fetch Nimble dependencies
+nimble build -y
+nim c -r <mytest.nim>
+----