Updated Readmes; renamed servers to reference servers

Docker/reference-servers/omnisharp/Dockerfile

@@ -0,0 +1,18 @@
+FROM debian:12.11-slim
+
+ARG VERSION=1.39.12
+LABEL version="${VERSION}"
+
+WORKDIR /tmp
+
+RUN apt-get update \
+    && apt-get install curl=7.88.1-10+deb12u12 --no-install-recommends --yes \
+    && apt-get reinstall ca-certificates=20230311+deb12u1 --yes \
+    && update-ca-certificates \
+    && curl -L -O https://github.com/OmniSharp/omnisharp-roslyn/releases/download/v${VERSION}/omnisharp-linux-x64.tar.gz \
+    && tar -xf omnisharp-linux-x64.tar.gz -C /usr \
+    && rm omnisharp-linux-x64.tar.gz \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+CMD [ "/usr/run", "--languageserver" ]