Initial commit: implement schema, subject methods.

Dockerfile

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+FROM alpine:3.12
+
+ARG schema_registry_cli_version=0.1
+
+LABEL org.label-schema.name="schema-registry-cli" \
+      org.label-schema.description="Schema Registry command-line client" \
+      org.label-schema.build-date="${build_date}" \
+      org.label-schema.vcs-url="https://github.com/dongjinleekr/schema-registry-cli" \
+      org.label-schema.vcs-ref="${vcs_ref}" \
+      org.label-schema.version="${schema_registry_cli_version}" \
+      org.label-schema.schema-version="1.0" \
+      maintainer="[email protected]"
+
+COPY schema-registry-cli /tmp/
+
+RUN apk add --no-cache bash dumb-init curl jq \
+ && chmod a+x /tmp/schema-registry-cli \
+ && mv /tmp/schema-registry-cli /usr/bin \
+ && sync
+
+ENTRYPOINT [ "/usr/bin/dumb-init" ]
+

LICENSE

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+MIT License
+
+Copyright (c) 2020 Lee Dongjin
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+schema-registry-cli
+=====
+
+A Command-line Schema Registry client based on curl, written in bash.
+
+# How to use
+
+```sh
+# list the subjects, available with localhost:8083 endpoint.
+schema-registry-cli subject list
+
+# Can change the Schema Registry endpoint.
+SCHEMA_REGISTRY_URL={schema-registry-url}:8081 schema-registry-cli subject list
+
+# Dry run: shows appropriate curl command only.
+SCHEMA_REGISTRY_URL={schema-registry-url}:8081 DRY_RUN=1 schema-registry-cli subject list
+
+# Result with JQ: show installed connectors
+SCHEMA_REGISTRY_URL={schema-registry-url}:8081 schema-registry-cli subject list | jq
+
+# Input from stdin: Create a new subject
+cat avro-schema.json | SCHEMA_REGISTRY_URL={schema-registry-url}:8081 schema-registry-cli subject create {subject-name}
+
+# In Kubernetes: use 'env'.
+kubectl -n default exec -it schema-registry-client -- env SCHEMA_REGISTRY_URL={schema-registry-url}:8081 schema-registry-cli subject list
+```
+
+# Docker Support
+
+You can run this tool with provided docker image, `dongjinleekr/schema-registry-cli`. Below is the kubernetes pod configuration of this tool.
+
+```
+apiVersion: v1
+kind: Pod
+metadata:
+  name: schema-registry-client
+  namespace: default
+spec:
+  containers:
+    - name: schema-registry-client
+      image: dongjinleekr/schema-registry-cli:0.1
+      command:
+        - sh
+        - -c
+        - "exec tail -f /dev/null"
+```
+
+To build your own Docker image, run the following:
+
+```sh
+# Build 0.1
+export SCHEMA_REGISTRY_CLI_VERSION=0.1 && docker build --build-arg schema_registry_cli_version=${SCHEMA_REGISTRY_CLI_VERSION} -t dongjinleekr/schema-registry-cli:${SCHEMA_REGISTRY_CLI_VERSION} .
+```
+