Add laconicd fixturenet readme

stacks/laconicd/README.md

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+# Laconicd Fixturenet
+
+Instructions for deploying a local Laconic blockchain "fixturenet" for development and testing purposes using laconic-stack-orchestrator (the installation of which is covered [here](https://github.com/cerc-io/stack-orchestrator#install)):
+
+## Clone required repositories
+```
+$ laconic-so setup-repositories --include cerc-io/laconicd,cerc-io/laconic-sdk,cerc-io/laconic-cns-cli
+```
+## Build the laconicd container
+```
+$ laconic-sh build-containers --include cerc/laconicd
+```
+This should create a container with tag `cerc/watcher-mobymask` in the local image registry.
+## Deploy the stack
+First the watcher database has to be initialized. Start only the watcher-db service:
+```
+$ laconic-so deploy-system --include fixturenet-laconicd
+```
+Correct operation should be verified by checking the laconicd container's log.

stacks/laconicd/stack.yml

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+version: "1.0"
+name: laconicd-fixturenet
+repos:
+  - cerc-io/laconicd
+  - cerc-io/laconic-sdk
+  - cerc-io/laconic-cns-cli
+containers:
+  - cerc/laconicd
+  - cerc/laconic-cns-cli
+pods:
+  - fixturenet-laconicd