NFC: add .vscode/launch.json (#700)

* NFC: add `.vscode/launch.json`

The workspace wide configuration should be portable, and allows us to add any recommended flags, which is convenient for getting started.

* Add trailing newline, remove `tasks.json`

Author: MaxDesiatov

.vscode/launch.json

@@ -0,0 +1,22 @@
+{
+    "configurations": [
+        {
+            "type": "lldb",
+            "request": "launch",
+            "name": "Debug sourcekit-lsp",
+            "program": "${workspaceFolder:sourcekit-lsp}/.build/debug/sourcekit-lsp",
+            "args": [],
+            "cwd": "${workspaceFolder:sourcekit-lsp}",
+            "preLaunchTask": "swift: Build Debug sourcekit-lsp"
+        },
+        {
+            "type": "lldb",
+            "request": "launch",
+            "name": "Release sourcekit-lsp",
+            "program": "${workspaceFolder:sourcekit-lsp}/.build/release/sourcekit-lsp",
+            "args": [],
+            "cwd": "${workspaceFolder:sourcekit-lsp}",
+            "preLaunchTask": "swift: Build Release sourcekit-lsp"
+        }
+    ]
+}