re-add files from old wallet repo to contrib/

contrib/ide/README

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+Settings and project files for IDEs and other tools should be stored here.

contrib/ide/codeStyle.xml

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+<code_scheme name="GNU Taler">
+  <option name="RIGHT_MARGIN" value="80" />
+  <option name="WRAP_WHEN_TYPING_REACHES_RIGHT_MARGIN" value="true" />
+  <TypeScriptCodeStyleSettings>
+    <option name="SPACE_AFTER_TYPE_COLON" value="true" />
+    <option name="SPACE_BEFORE_FUNCTION_LEFT_PARENTH" value="false" />
+  </TypeScriptCodeStyleSettings>
+  <XML>
+    <option name="XML_LEGACY_SETTINGS_IMPORTED" value="true" />
+  </XML>
+  <codeStyleSettings language="HTML">
+    <indentOptions>
+      <option name="INDENT_SIZE" value="2" />
+      <option name="CONTINUATION_INDENT_SIZE" value="4" />
+      <option name="TAB_SIZE" value="2" />
+    </indentOptions>
+  </codeStyleSettings>
+  <codeStyleSettings language="JavaScript">
+    <indentOptions>
+      <option name="INDENT_SIZE" value="2" />
+      <option name="CONTINUATION_INDENT_SIZE" value="2" />
+      <option name="TAB_SIZE" value="2" />
+    </indentOptions>
+  </codeStyleSettings>
+  <codeStyleSettings language="TypeScript">
+    <option name="ALIGN_MULTILINE_CHAINED_METHODS" value="true" />
+    <option name="ALIGN_MULTILINE_PARAMETERS_IN_CALLS" value="true" />
+    <option name="ALIGN_MULTILINE_ARRAY_INITIALIZER_EXPRESSION" value="true" />
+    <option name="CALL_PARAMETERS_WRAP" value="5" />
+    <option name="PREFER_PARAMETERS_WRAP" value="true" />
+    <option name="METHOD_PARAMETERS_WRAP" value="5" />
+    <option name="METHOD_CALL_CHAIN_WRAP" value="5" />
+    <option name="FOR_STATEMENT_WRAP" value="5" />
+    <option name="ARRAY_INITIALIZER_WRAP" value="5" />
+    <option name="ARRAY_INITIALIZER_LBRACE_ON_NEXT_LINE" value="true" />
+    <option name="ARRAY_INITIALIZER_RBRACE_ON_NEXT_LINE" value="true" />
+    <option name="IF_BRACE_FORCE" value="3" />
+    <indentOptions>
+      <option name="INDENT_SIZE" value="2" />
+      <option name="CONTINUATION_INDENT_SIZE" value="2" />
+      <option name="TAB_SIZE" value="2" />
+    </indentOptions>
+  </codeStyleSettings>
+</code_scheme>

contrib/style.txt

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+TypeScript style
+================
+
+Basics:
+- Indent with 2 spaces.
+- Keep a maximum line length of 120 characters.
+- Prefer "double quotes" for strings.
+- Never omit optional semicolons.
+- Do not put opening braces or brackets on a new line.
+- Call functions without spaces: foo(bar)
+- Use 'let' instead of 'var' whenever possible.
+- Declare "use strict;".
+- Use rocket (=>) syntax for anonymous functions.  If an anonymous function is
+  too long, make it a named function.
+- Use the strict equality operator (===).
+- Document functions with JSDoc comments (http://usejsdoc.org).
+
+
+JavaScript version:
+Stick to ES6 features.  Do not rely on any vendor-specific extensions (such as
+Firefox often offers).  ES6 features not yet supported by major browsers are
+okay as long as there is a well-supported and reasonable polyfill (such as
+babel) available.
+
+
+Names:
+- Use PascalCase for classes/types, camelCase for variables, functions and
+  properties, UPPER_SNAKE_CASE for constants, kebab-case for event names.
+- Only capitalize the first letter of an acronym in identifiers (e.g. HttpResponseCode).
+
+
+APIs:
+- Prefer 'Promise' to one-shot continuations whenever possible.
+- Prefer handlebars templates to poking around in the DOM.
+
+
+Dependency Injection (DI):
+DI is a useful pattern when components need to be replaced by mocks or have
+multiple co-existing implementations.  But DI also makes code overly generic,
+bureaucratic and less readble.  Only use DI if there is a definite need for it,
+do not use it by default.  Inject individual dependencies via class
+constructors and avoid service locators.
+
+
+Misc:
+- Do not use ES6 template strings for constructing HTML,
+  use TSX/JSX literals instead.
+- For everything not covered here, stick to this style guide:
+  https://github.com/airbnb/javascript.