Add a readme

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README.md

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+# NATS - Zig Client
+
+This is a Zig client library for the [NATS messaging system](https://nats.io). It's currently a thin wrapper over [NATS.c](https://github.com/nats-io/nats.c).
+
+There are three main goals:
+
+  1. Provide a Zig package that can be used with the Zig package manager.
+  2. Provide a native-feeling Zig client API.
+  3. Support cross-compilation to the platforms that Zig supports.
+
+Right now, in service of goal 3, the underlying C library is built without certain features (notably, without TLS support and without streaming support) because those features require wrangling some complex transitive dependencies (OpenSSL and Protocol Buffers, respectively). Solving this limitation is somewhere on the roadmap, but it's not high priority.
+
+# Building
+
+Currently, a demonstration executable can be built in the standard fashion, i.e. by running `zig build`.
+
+# License
+
+```
+Licensed under the Apache License, Version 2.0 (the "License");
+You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+```