lang/{go,javascript}: add READMEs

modules/lang/go/README.md

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+# Go
+
+Go support, including auto-completion (gocode), eldoc support (go-eldoc), REPL
+support (gore), refactoring commands (gorename), syntax-checking (flycheck),
+auto-formatting (gofmt), and snippets (yasnippet).
+
+Snippets can be found in `private/hlissner/snippets/go-mode`.
+
+## External Dependencies
+
+Run `make bootstrap go` to install these.
+
++ Go (`brew install go`, `pacman -S go`)
++ gocode `go get -u github.com/nsf/gocode` (completion)
++ gore `go get -u github.com/motemen/gore` (REPL)
++ guru `golang.org/x/tools/cmd/guru` (code navigation commands)
++ gorename `golang.org/x/tools/cmd/gorename` (refactoring commands)
+

modules/lang/javascript/README.md

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+# javascript
+
+Javascript support, including auto-completion (tern), REPL support
+(nodejs-repl), refactoring commands (js2-refactor), and syntax checking
+(flycheck).
+
+Includes coffescript and jsx support, as well as project minor modes for nodejs
+projects (with a package.json) or launchbar 6 actions.
+
+## External Dependencies
+
+Run `make bootstrap js` to install these.
+
++ NodeJS & NPM (`brew install node`, `pacman -S nodejs npm`)
++ tern: `npm -g install tern` (for completion)
+