loam init; initial oracle contract implementation

while not part of our specific app, i have started off by implementing
the oracle contract so that we can build against it locally, and to
exercise and learn about Loam SDK with a concrete example before getting
into more open-ended territory.

.gitattributes

@@ -0,0 +1,2 @@
+Cargo.lock text -merge eol=lf linguist-generated=true -diff
+package-lock.json linguist-generated=true -diff

.gitignore

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+# Rust's output directory
+target
+
+# Local Soroban settings
+.soroban
+
+
+# The following is from the Frontend Template's .gitignore
+
+# soroban/Rust output
+target
+.soroban
+
+# build output
+dist/
+
+# generated types
+.astro/
+
+# dependencies
+node_modules/
+
+# logs
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+
+# environment variables
+.env
+.env.production
+
+# macOS-specific files
+.DS_Store
+
+# generated contract clients
+packages/*
+# if you have other workspace packages, add them here
+!packages/.gitkeep
+
+# generated contract client imports
+src/contracts/*
+!src/contracts/util.ts