Add drone config

.drone.yml

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+workspace:
+    base: /code
+    path: src
+
+pipeline:
+    release:
+        image: rust:latest
+        commands:
+          - cargo build --release
+        when:
+            event: tag
+
+    test:
+        commands:
+          - cargo test
+        when:
+            branch: master
+
+    gitea_release:
+        image: plugins/gitea-release
+        secrets: [ gitea_token ]
+        base_url: https://git.schneider-hosting.de/
+        files: target/release/stopwatch
+        when:
+            event: tag

README.md

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+# stopwatch
+
+A very simple Stopwatch for the command line
+
+