Add appveyor and travis yaml files

.appveyor.yml

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+version: '{build}'
+
+image: Visual Studio 2015
+
+init: # Scripts called at the very beginning
+  # Enable paths > 260 characters
+  - ps: Set-ItemProperty -Path 'HKLM:\SYSTEM\CurrentControlSet\Control\FileSystem' -Name 'LongPathsEnabled' -Value 1
+  - git config --global core.longpaths true
+
+cache:
+  - NimBinaries
+
+matrix:
+  # We always want 32 and 64-bit compilation
+  fast_finish: false
+
+platform:
+  - x64
+  - x86
+
+install:
+  # use the newest versions documented here: https://www.appveyor.com/docs/windows-images-software/#mingw-msys-cygwin
+  - IF "%PLATFORM%" == "x86" SET PATH=C:\mingw-w64\i686-6.3.0-posix-dwarf-rt_v5-rev1\mingw32\bin;%PATH%
+  - IF "%PLATFORM%" == "x64" SET PATH=C:\mingw-w64\x86_64-8.1.0-posix-seh-rt_v6-rev0\mingw64\bin;%PATH%
+
+build_script:
+  # the 32-bit build is done on a 64-bit image, so we need to override the architecture
+  - mingw32-make -j2 ARCH_OVERRIDE=%PLATFORM% CI_CACHE=NimBinaries update
+  - mingw32-make -j2 ARCH_OVERRIDE=%PLATFORM% fetch-dlls
+
+test_script:
+  - mingw32-make -j2 ARCH_OVERRIDE=%PLATFORM% LOG_LEVEL=TRACE
+  - build\wakunode.exe --help
+  - mingw32-make -j2 ARCH_OVERRIDE=%PLATFORM% test
+
+deploy: off

.travis.yml

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+language: c
+
+dist: bionic
+
+# https://docs.travis-ci.com/user/caching/
+cache:
+  ccache: true
+  directories:
+    - vendor/nimbus-build-system/vendor/Nim/bin
+
+git:
+  # when multiple CI builds are queued, the tested commit needs to be in the last X commits cloned with "--depth X"
+  depth: 10
+
+matrix:
+  include:
+    - os: linux
+      arch: amd64
+      sudo: required
+      env:
+        - NPROC=2
+      before_install:
+        - export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/usr/local/lib"
+        - sudo apt-get -q update
+    - os: linux
+      arch: arm64
+      sudo: required
+      env:
+        - NPROC=6 # Worth trying more than 2 parallel jobs: https://travis-ci.community/t/no-cache-support-on-arm64/5416/8
+        # (also used to get a different cache key than the amd64 one)
+      before_install:
+        - export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/usr/local/lib"
+        - sudo apt-get -q update
+        - sudo apt-get install -y libpcre3-dev
+    - os: osx
+      before_install:
+        - HOMEBREW_NO_AUTO_UPDATE=1 HOMEBREW_NO_INSTALL_CLEANUP=1 brew install ccache
+      env:
+        - NPROC=2
+
+script:
+  - set -e # fail fast
+  # Building Nim-1.0.4 takes up to 10 minutes on Travis - the time limit after which jobs are cancelled for having no output
+  - make -j${NPROC} NIMFLAGS="--parallelBuild:${NPROC}" V=1 update # to allow a newer Nim version to be detected
+  - make -j${NPROC} NIMFLAGS="--parallelBuild:${NPROC}" LOG_LEVEL=TRACE
+  - build/wakunode --help
+  - make -j${NPROC} NIMFLAGS="--parallelBuild:${NPROC}" test
+