.builds: add automatic testing script

Add fedora.yml for testing on linux and windows.

Add android.yml for testing `gogio -target android`.

Add a build badge to the README.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

.builds/android.yml

@@ -0,0 +1,36 @@
+image: fedora/latest
+packages:
+ - tar
+ - java-1.8.0-openjdk-devel
+sources:
+ - https://git.sr.ht/~eliasnaur/gio
+environment:
+   PATH: $PATH:/usr/bin:/home/build/goroot/go/bin:/home/build/go/bin:/home/build/android/tools/bin
+   ANDROID_HOME: /home/build/android
+   android_sdk_tools_zip: sdk-tools-linux-3859397.zip
+   android_ndk_zip: android-ndk-r20-linux-x86_64.zip
+tasks:
+ - install_go: |
+     mkdir goroot
+     cd goroot
+     curl -s -o go.tar.gz https://dl.google.com/go/go1.13.3.linux-amd64.tar.gz
+     tar xzf go.tar.gz
+     rm go.tar.gz
+ - install_android: |
+     mkdir android
+     cd android
+     curl -so sdk-tools.zip https://dl.google.com/android/repository/$android_sdk_tools_zip
+     unzip -q sdk-tools.zip
+     rm sdk-tools.zip
+     curl -so ndk.zip https://dl.google.com/android/repository/$android_ndk_zip
+     unzip -q ndk.zip
+     rm ndk.zip
+     mv android-ndk-* ndk-bundle
+     yes|sdkmanager --licenses
+     sdkmanager "platforms;android-29" "build-tools;29.0.2"
+ - install_gogio: |
+     cd gio/cmd
+     go install ./gogio
+ - test_android: |
+     cd gio/example
+     gogio -target android ./kitchen